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# Determinants of current account imbalance in the global economy: a dynamic panel analysis

- Debasish Kumar Das
^{1}Email author

**5**:8

https://doi.org/10.1186/s40008-016-0039-6

© Das. 2016

**Received:**13 January 2015**Accepted:**8 March 2016**Published:**18 March 2016

## Abstract

This paper presents an empirical investigation of the determinants of current account imbalance for the large sample of developed, emerging and developing countries during 1980–2011. Using dynamic panel GMM techniques, this study characterizes that current account balance is positively correlated with net foreign assets, trade openness and exchange rate stability and negatively associated with commodity price, real GDP growth and real effective exchange rate for the developed countries. While, among emerging countries, commodity price, real GDP growth, trade openness and de jure capital openness are positively correlated with net foreign asset, exchange rate stability index is negatively related to current account balance. These findings suggest that the current account determinants explain different characteristics in terms of different country groups.

## Keywords

- Current account determinants
- Global imbalance
- Dynamic panel GMM

## JEL Classification

- F62
- F30
- C33

## 1 Background

Today the world aggregate current account balances as a share of global output are twice as large as in mid-1980s, while the net foreign asset positions have boosted up threefold (Bracke et al. 2010). Global current account imbalance is also rising with the USA and other major developed economies running a persistent current account deficit against some emerging market countries with big surpluses. Notably, the 2007 US current account deficit has enlarged to 6 % from 2.4 % in 1998. Alike, the Eurozone current account deficit has widened over 4 % of GDP in 2008. This unexpected rise in current account deficit beyond historical standard has received a substantial attention in recent year.

On contrary, China and other Asian Tigers (South Korea, Malaysia, Singapore, Indonesia and Thailand) are running current account surplus on an average 6.4 % of GDP in 2000–2009 which put forward them to one of the world’s largest lender. In spite of having rapid growth and enormous domestic investment opportunities, these economies have increasingly been outflowing a major portion of their savings to foreign countries. Additionally, other emerging economies including Mexico, Argentina, Brazil and Middle Eastern oil exporters also are increasing their potentiality toward current account surpluses since 1990s. Thus, many (Bernanke 2005; Prasad et al. 2007; Carroll and Jeanne 2009; Buera and Shin 2009; Aguiar and Amador 2011; Miller et al. 2011) observe that superfluous savings is uphilling from capital-scarce emerging and developing economies to the capital-abundant developed countries during the last two decades. This observed counterintuitive phenomenon widely revealed as ‘Lucas Paradox.’^{1}

Many alternative theoretical models (Bussière et al. 2004; Obstfeld and Rogoff 1995b; Caballero et al. 2008; Edwards 1996; Gourinchas and Jeanne 2013) have given diverse forecast of the underlying determinants of current account imbalances. Some empirical studies (Debelle and Faruqee 1996; Chinn and Prasad 2003; Chinn and Ito 2007; Lee et al. 2008) have tested these theoretical framework, either directly or indirectly to examine the determinants of current account balance. Since, most of the studies consider only developed and some emerging economies, which limit to capture the actual impact of potential current account determinants. Given this background, it is essential to find out the significant determinants using advanced technique and large sample which is rarely portrayed either in theory or in empirical investigation. Thus, the determinants of global current account imbalance remain ambiguous in theoretical and empirical discussion. Hence, this research contributes a broad empirical characterization to analyze the determinants of global current account imbalances covering a large heterogeneous group of 106 countries under dynamic panel GMM framework.

The main reference comes from few empirical papers (Glick and Rogoff 1995; Calderon et al. 2002; Chinn and Prasad 2003; Gruber and Kamin 2007; Chinn and Ito 2007) on the determinants of current account balance from which this article borrow the baseline information. Except others’ this study improves this work in two way, first, use commodity price index, de jure classification of capital openness and exchange rate stability index along with other commonly used determinants (e.g., net foreign assets, real effective exchange rate, real GDP growth and trade openness), which better captures the determinants of global current account imbalances. Second, employ the difference and system GMM estimation in a strongly balanced panel framework of 106 sample countries (among them 27 developed, 32 emerging and 47 developing economies) using enriched data from various sources over the time period 1980–2011.

It is essential to emphasize at this point that this paper does not intent to revisit the previous finding in the current or capital account literatures. Instead, it draws on those finding only to obtain a reasonable set of additional explanatory and control variables along with commonly used determinants in the literature to find the determinants of global current account imbalances.

This paper proceeds as follows. Section 2 lays out the empirical motivation. Section 3 contains a discussion of some theoretical and empirical literature. Section 4 describes data and descriptive statistics. Section 5 presents estimation techniques. Section 6 describes the results, while Sect. 7 details the results of selected robustness checks. Finally, Sect. 8 offers conclusion and direction for future research.

## 2 Empirical motivation

^{2}considering different countries and groups, i.e., Eurozone, BRICS and Asian tigers. It observes that USA and Eurozone economies (excluding Germany) have run large and persistent current account deficit from 2000s and China and other emerging economies are running high and persistent current account surpluses.

Thus, it can be plausible that this disorder current account imbalance is carrying risk. As a result, the uphill capital flows funding for current account deficit could be a big change in exchange rate with possibly global ramifications. Additionally, there is always a potential risk of huge trade imbalances that might force deficit economies twist to protectionist measures.

Accordingly, to analyze the determinants of global current account imbalance, it is vital to check whether the trend of current account balance is persistent or not. While dealing with dynamism, if the current account is not persistent, the validity of the estimated result will be debatable. Although the implication of the current account has undergone through several tests, it is very difficult to draw a generalized conclusion about its sustainability because of the inconsistency in the literature (Clower and Ito 2011). Some studies reveal that some economies may hold unsustainable current account balance for the short term (Raybaudi et al. 2004; Taylor 2002). Hence, the key attentions search through the persistency of current account balance prior to examine its determinants.

The second key observation induces to the financial openness in perspectives of both de jure and de facto measures by considering Chinn and Ito (2008) index of the degree of capital openness as a de jure measure. This index value is based on information regarding restrictions in the IMF’s *Annual Report on Exchange Arrangements and Exchange Restrictions* (*AREAER*), which is normalized between 0 and 1. Higher values of this index indicate that a country is more open to cross-border capital transactions.

As de jure capital openness depicts how flexible the countries’ law is, thus to get complete picturization, this paper also measured de facto capital openness which indicates the sum of total foreign assets and total foreign liabilities over GDP multiplied by 100. The de facto capital openness shows that how much the country is really open for the financial and macroeconomic integration.

Finally, taking into account the exchange rate stability as one of the key determinant of current account imbalance. The index value calculates yearly standard deviation of monthly exchange rate between home and base country to measure exchange rate stability index (Aizenman et al. 2010). The USA is considered as the base country for emerging and developing economies, and Germany is treated as base for EU countries. The index value is normalized between 0 and 1 by using the prescribed formula.^{3} The lower bound of the exchange rate stability index (0) indicates the instability, and the upper bound (0) indicates exchange rate stability.

## 3 Literature review

The beginning of the global current account imbalance analysis dates back to Sachs (1981) through the intertemporal approach and follows up by Obstfeld and Rogoff (1984), Milesi-Ferrett and Razin (1996) and Milesi-Ferretti and Razin (1998a, b). The standard approach to this hypothesis focuses on the issue that current consumption is equal to the share of the present discounted value of future expected net output or net assets. Therefore, the change in current consumption is determined by either change in interest rate or future expectation of assets due to productivity shocks or reduced investment and government expenditure (Chinn et al. 2014). This model provides diversified channels of positive and negative income shocks, productivity shocks and liquidity constraint for explaining current account determination (Obstfeld and Rogoff 1995b). Several empirical studies (Sheffrin and Woo 1990; Milbourne and Otto 1992; Otto and Voss 1995; Bergin 2006) have been focused on intertemporal approaches of global current account imbalances. They mainly observed the additional determinants that possibly will affect consumption and savings decision.

However, the origin of current account imbalance has been theoretically explicated in two basic views. The first view deems imbalance as an oscillating trend, which is better termed as ‘disequilibrium approach.’ The second view characterizes a completely reverse outlook that current account imbalance is an equilibrium situation in which the change in determinants can be self-sustaining, which is better termed as ‘equilibrium approach.’ Under the disequilibrium approach, Obstfeld and Rogoff (2005, 2009) emphasize the magnitude of depreciation and trade balance correction for the current imbalance. Some studies (Gourinchas and Rey 2007; Blanchard et al. 2005) dictate that real adjustment and financial adjustment are necessary for global financial or balance sheet correction because of the change in countries’ net foreign asset positions. Since, net foreign asset position consists of the change in the price of foreign asset and liabilities and the current account balance.

As opposed to the disequilibrium approach, which emphasizes the current account, equilibrium approach highlights the capital account. On the issue of international asymmetries in the supply and demand of financial assets, Caballero et al. (2008) emphasize that the financial underdevelopment of the emerging economies causes less attractive financial tools for the savers due to instable and volatile financial market. This financial underdevelopment and financial crisis including Mexico in 1994, East Asian countries in 1997, Brazil in 1999, Argentina in 2002 and Turkey in 2003 creates flow of US deficit, which is usually known as ‘global saving glut’ hypothesis (Bernanke 2005; Clarida 2005). Miller et al. (2011) discern, after the financial crisis in the emerging countries, they adopted cautious financial policy, whereas exuberance in consumption, housing and credit of the Western countries crafted the global imbalance severe.

Moreover, for investigating the ground of saving glut hypothesis, one should assess the financial and institutional development explaining the pattern of global current account imbalance. Using a structural model (Chinn and Ito 2007) makes opposite stand to the lower savings rate after achieving the infrastructural and financial development in emerging market particularly in East Asia. Similarly, Miller et al. (2011) find the massive saving in Asian emerging nations has hardly been a causal factor for the current account imbalance. For the explanation and forecasting of the current account imbalance, the results are very sensitive to the different indicators of financial development such as bond, equity, insurance market activity, cost, size and activeness of the industry (Ito and Chinn 2007). Additionally, on the ground of the stakeholder’s behavior, irrational optimistic or pessimistic vision (Akerlof and Shiller 2010), market imperfections because of asymmetries in information (Stiglitz 2010) and rent seeking (Johnson and Kwak 2011) cause financial distortion and pave the way to global current account imbalance.

A dearth number of researchers have highlighted the capital flows to emerging and developing countries underlying the ‘push’ and ‘pull’ factors (Calvo et al. 1993; Corbo and Hernandez 1996; Fernandez-Arias and Montiel 1996). While dealing with capital flow, one may need to consider current and capital account reversal. A large deficit indicating temporary flow of investment with high productivity growth and profitability will have a different implication that the temporary deficit with high public consumption and currency overvaluation. Milesi-Ferretti and Razin (2000) analyze the indicators that could forecast current account reversal and suggested to reduce current account deficit at least 3–5 % of GDP over the time of 3 years. De Mello et al. (2011, 2012) claim that current account reversal has a long-term impact on the economic growth, whereas other policy analyst (Abiad et al. 2009; Freund and Warnock 2007; Debelle and Galati 2007) treated it as short-lived phenomenon.

Chinn and Prasad (2003) emphasize that instead of capital controls country’s financial development is positively correlated with current account balance in developing countries. Contradicting this result, Cheung et al. (2013) and Mendoza et al. (2009) show that financial sector development measured by private credit ratio has a negative impact on current account balance. Such negative relation might arise from the fact that developed financial system and legal investment protection regulation may divert the capital flows into other countries with more liquid assets and competitive market (Bernanke 2005; Ju and Wei 2006). Similarly, Alfaro et al. (2008) confirm that domestic and international market imperfection, low institutional quality and weak governance structure in developing countries increase the investor’s high risk of return. Thus, capital is uphilling in the relatively more stable and developed financial system particularly in European and North American economies (Caballero et al. 2008). Besides, based on an empirical research of a panel of developing countries Calderon et al. (2002) reveal that high current account deficit tends to associate with output growth, in terms of trade shock and currency appreciation. However, past global economic shocks such as Asian crisis, Latin American crisis and recent financial crisis reduce the investment levels (Reinhart and Rogoff 2008; Chinn and Ito 2007; Eichengreen 2006).

Summing up the above literature survey, it is obvious that various theory and empirical results produce heterogeneous predictions on the underlying determinants of current account imbalance which opens the avenue for further investigation. However, in the literature some important variables such as commodity price and exchange rate stability are largely ignored as a determinant. Thus, the main objective of this research is to investigate considering these variables together with other important determinants supported by the literature (Glick and Rogoff 1995; Chinn and Prasad 2003; Chinn and Ito 2007) employing advanced estimation techniques across different groups of countries.

## 4 Data and descriptive statistics

This paper considers a strongly balanced panel of annual data for 106 countries over the period 1980–2011. The basic dataset has annual data for 27 high-income industrial, 32 emerging and 47 developing countries around the world. The sample country groups are selected according to the IMF World Economic Outlook, World Bank, S&P and FTSE.^{4} Variable definitions and data sources as well as list of countries in same and country grouping are presented in “Appendix.” This constructed dataset considers eight potential current account imbalance determinants for the analysis. It assumes that a subset of the fundamental along with the main variables is relevant and let the estimation techniques to determine which are the most important determinants in the global economy.

This research uses data from various sources, including IMF Balance of Payment Statistics (BOPS), World Bank Development Indicators (WDI), United Nations Conference for Trade and Development (UNCTAD), IMF International Financial Statistics (IFS), Bank of International Settlements (BIS), Lane and Milesi-Ferretti (2008),Chinn and Ito (2012), PWT (2012), Laeven and Valencia (2012), Aizenman et al. (2012) and Darvas (2012).

Summary statistics

Variable description | Developed (27 countries, 864 annual obs.) | Emerging (32 countries, 1024 annual obs.) | Developing (47 countries, 1504 annual obs.) | |||
---|---|---|---|---|---|---|

Mean | Std. dev. | Mean | Std. dev. | Mean | Std. dev. | |

Current account balance (% of GDP) | −0.63 | 5.67 | −0.39 | 12.49 | 13.27 | 21.03 |

Real GDP growth rate | 2.60 | 2.84 | 4.40 | 5.34 | 3.32 | 4.92 |

∆ Real effective exchange rate | 0.34 | 6.89 | 0.06 | 13.17 | 0.68 | 25.71 |

Commodity price index | 40.54 | 72.89 | 128.7 | 76.29 | 135.8 | 71.61 |

Net foreign assets (% of GDP) | −21.56 | 41.65 | −16.34 | 74.31 | −78.84 | 85.63 |

Trade openness | 52.28 | 22.58 | 63.20 | 54.97 | 58.36 | 31.89 |

de jure capital openness | 0.73 | 0.32 | 0.46 | 0.33 | 0.36 | 0.29 |

Exchange rate stability index | 0.51 | 0.28 | 0.55 | 0.31 | 0.70 | 0.34 |

## 5 Estimation techniques

In this section, firstly, employ the panel unit root test to reveal that whether a cointegration relationship is present in the current account balance for all countries during the sample period. Secondly, estimate the dynamic generalized method of moments (GMM) panel estimators.

### 5.1 Panel unit root test

This work starts with panel unit root test for corresponding variables. Panel unit root test is developed from time-series unit root test. This development emphasized to combine the asymptotic characteristics of the time-series dimension *T* and cross-sectional dimension *N*. There are several procedures to analyze the panel unit root tests. Among them, I use Levin–Lin–Chu test (LLC) and Im–Pesaran–Shin test (IPS) test.

#### 5.1.1 Levin–Lin–Chu (LLC) test

#### 5.1.2 Im–Pesaran–Shin (IPS) test

The IPS test formulated by Im et al. (2003) is the extension of LLC test incorporating heterogeneity in the dataset under alternative hypothesis. Here, IPS test estimation is also based on Eq. (1). The null hypothesis is stated as \(H_{0} :\rho_{i} = 0\;\forall \,i\) against the alternative hypothesis of \(H_{A} :\rho_{i} < 0\) where *i* = 1, 2, 3, …, *N*
_{1}; *ρ*
_{
i
} = 0, *i* = *N*
_{1} + 1, *N*
_{1} + 2, …, *N*. In IPS test, it is presumed that all series is non-stationary under null hypothesis and a fraction of the series is stationary under alternative hypothesis. It is the difference with LLC test, in which all series are supposed to be stationary under alternative hypothesis.

### 5.2 GMM estimators for dynamic panel models

*X*represents the set of explanatory variables (real GDP growth rate, ∆ real effective exchange rate, commodity price index, net foreign assets, trade openness, de jure capital openness (Chinn–Ito index), de facto capital openness, exchange rate stability index and crisis dummy) other than the lagged current account balance.

*ε*

_{ i,t }is an independently distributed error term with

*E*[

*ε*

_{ i,t }] = 0, and the subscripts

*I*and

*t*denote country and time period, respectively.

*η*

_{ i }is an unobserved country-specific effect which is not correlated with

*ε*

_{ i,t }, and \(i = 1, \ldots ,N\,{\text{and}}\,t = 2, \ldots ,T,\) where (

*η*

_{ i }+

*ε*

_{ i,t }) have the standard error component structure; For Eq. (2), \(E[\eta_{i} ] = 0,\,E[\varepsilon_{i,t} ] = 0,\,E[\varepsilon_{i,t} ,\eta_{i} ] = 0\;{\text{for}}\;i = 1, \ldots ,N\) and \(t = 2, \ldots ,T\)

^{5}Therefore, the dynamic panel GMM estimator employs the following moment conditions based on difference estimator for Eq. (2);

*M*is the instruments matrix corresponding to the endogenous variables, where

*y*

_{ i,t−s }refers to CAB

_{ i,t−s }for Eq. (4).

To check the validity of the instruments in the system GMM estimator, this research implemented several specification tests, which is suggested by Arellano and Bond (1991), Arellano and Bover (1995) and Blundell and Bond (1998): first, the Sargan and Hansen *J* tests for over-identification to check the validity of the instruments; second, the Diff-in-Hansen test to check the validity of additional moment restriction necessary for system GMM; and finally, Arellano–Bond test to check the hypothesis that error term is serially uncorrelated.

## 6 Results

This section presents the estimation results, which aims to find the determinants of current account imbalances in the global economy. Firstly, check the stationarity of the panel dataset by using Levin–Lin–Chu (LLC) and Im–Pesaran–Shin (IPS) unit root tests. Secondly, estimate Eq. (2) on the dataset described above by using difference and system GMM panel estimation. Subsequently, Sargan and Arellano–Bond (AB) tests to check the validity of the model and finally verify the robustness.

### 6.1 Panel unit root test results

Panel unit root test

Variables | CAB (% of GDP) | Real GDP growth rate | ∆ REER | NFA (% of GDP) | Openness of trade |
---|---|---|---|---|---|

Levin–Lin–Chu (LLC) | −11.06*** | −30.62*** | −32.64*** | −5.19*** | −10.50*** |

Im–Pesaran–Shin (IPS) | −8.61*** | −31.09*** | −32.43*** | −3.19** | −7.15*** |

### 6.2 Basic results: persistency

Persistency results [AR(4) process of current account balance]

(1) | (2) | (3) | (4) | |
---|---|---|---|---|

POLS | FE | DGMM | SGMM | |

Lag 1. CAB (% of GDP) | 0.535*** | 0.434*** | 0.382*** | 0.378*** |

(0.017) | (0.018) | (0.004) | (0.005) | |

Lag 2. CAB (% of GDP) | 0.157*** | 0.065*** | 0.039*** | 0.024*** |

(0.017) | (0.017) | (0.002) | (0.002) | |

Lag 3. CAB (% of GDP) | 0.134*** | 0.053*** | 0.032*** | 0.038*** |

(0.012) | (0.012) | (0.003) | (0.004) | |

Lag 4. CAB (% of GDP) | 0.126*** | 0.047*** | 0.027*** | 0.024*** |

(0.014) | (0.013) | (0.003) | (0.003) | |

Observations | 3180 | 3180 | 3074 | 3180 |

| 0.42 | 0.47 | – | – |

Number of country | 106 | 106 | 106 | 106 |

The estimators of the 1-year lagged current account balance add to 0.535 and 0.157, 0.134, 0.126 of 2, 3 and 4 years lagged, respectively, for the pooled OLS model in specification (1), 0.434, 0.065, 0.053 and 0.047 in the within-group (fixed effects) estimator of specification (2), 0.382, 0.039, 0.032 and 0.027 in the difference GMM estimation in specification (3) and 0.378, 0.024, 0.038 and 0.024 in the system GMM model in specification (4), respectively. The AR (4) result indicates that the previous four terms and the noise term contribute to the current account balance. All four lags are positive, meaning that there is a persistent effect of the dynamics of current account balance. For more robustness check, this research considered AR (4) process instead of AR (1) or AR (2) of the current account balance to observe its persistency. In addition, various panel unit root tests (in table 6.1) confirmed that the current account balance (as a share of GDP) is stationary.

### 6.3 Dynamic panel GMM estimation results

Difference dynamic panel estimation results (Arellano and Bond 1991 difference GMM approach)

(1) | (2) | (3) | (4) | |
---|---|---|---|---|

Developed | Emerging | Developing | Full sample | |

Lag CAB (% of GDP) | 0.752*** | 0.396*** | 0.602*** | 0.420*** |

(0.026) | (0.006) | (0.061) | (0.0007) | |

Real GDP growth rate | −0.174*** | 0.627*** | −0.049*** | 0.383*** |

(0.015) | (0.049) | (0.012) | (0.002) | |

∆ REER | −0.019*** | −0.046*** | −0.0005 | −0.0007 |

(0.005) | (0.006) | (0.001) | (0.0006) | |

Commodity price index | −0.003 | 0.01** | 0.007*** | 0.009*** |

(0.004) | (0.004) | (0.002) | (0.0004) | |

Net foreign assets (% of GDP) | 1.502 | −8.069*** | 1.432** | −2.192*** |

(1.612) | (1.817) | (0.582) | (0.10) | |

Openness of trade | 0.022* | 0.096*** | 0.006** | 0.045*** |

(0.019) | (0.02) | (0.008) | (0.002) | |

de jure capital openness | −0.321 | −2.576 | −0.391 | −1.558** |

(3.352) | (2.443) | (4.472) | (0.313) | |

Exchange rate stability index | 2.171* | −1.171** | −1.177* | −1.767* |

(1.810) | (1.821) | (1.672) | (0.206) | |

Sargan test ( | 0.181 | 0.174 | 0.183 | 0.212 |

Hansen | 0.213 | 0.197 | 0.206 | 0.251 |

A–B test | 0.042 | 0.021 | 0.001 | 0.003 |

A–B test | 0.383 | 0.382 | 0.390 | 0.377 |

Observations | 837 | 992 | 1457 | 3286 |

Number of countries | 27 | 32 | 47 | 106 |

System dynamic panel estimation results (Blundell and Bond 1998 system GMM approach)

(1) | (2) | (3) | (4) | |
---|---|---|---|---|

Developed | Emerging | Developing | Full sample | |

Lag CAB (% of GDP) | 0.740*** | 0.407*** | 0.645*** | 0.414*** |

(0.045) | (0.003) | (0.013) | (0.001) | |

Real GDP growth rate | −0.225*** | 0.819*** | −0.049*** | 0.471*** |

(0.018) | (0.024) | (0.016) | (0.003) | |

∆ REER | −0.016*** | −0.103*** | −0.003** | −0.008*** |

(0.006) | (0.009) | (0.001) | (0.0009) | |

Commodity price index | −0.005 | 0.0139*** | 0.009*** | 0.0001 |

(0.005) | (0.004) | (0.002) | (0.0004) | |

Net foreign assets (% of GDP) | 2.893 | −0.423 | 2.064*** | −0.146** |

(1.957) | (0.538) | (0.715) | (0.064) | |

Openness of trade | 0.042*** | 0.036*** | 0.011 | 0.066*** |

(0.013) | (0.011) | (0.008) | (0.002) | |

de jure capital openness | −1.114 | 0.981 | −4.499 | −0.856* |

(3.749) | (2.139) | (4.094) | (0.153) | |

Exchange rate stability index | 1.517* | −2.079** | −0.712* | −3.200*** |

(1.084) | (1.294) | (1.369) | (0.230) | |

Sargan test ( | 0.231 | 0.185 | 0.217 | 0.280 |

Hansen | 0.273 | 0.168 | 0.236 | 0.260 |

Diff-in-Hansen test ( | 0.183 | 0.151 | 0.179 | 0.231 |

A–B test | 0.056 | 0.021 | 0.000 | 0.014 |

A–B test | 0.483 | 0.458 | 0.478 | 0.479 |

Observations | 837 | 992 | 1457 | 3286 |

Number of countries | 27 | 32 | 47 | 106 |

#### 6.3.1 Difference GMM estimation

The dynamic panel difference GMM estimation result shows the effect of potential determinants on current account imbalance in specification (1)–(4). Table 4 presents the result using Arellano and Bond (1991) difference GMM estimators. These specifications consider current account balance (CAB) (% of GDP) as a dependent variable with a lagged dependent variable and set of other explanatory variables (Eq. 2). The coefficients of the lagged current account balance confirm the significance of including this variable in all specifications, and the effect is quite similar, which means it has persistency as described earlier (Sect. 5.2).

Column 1 of Table 4 presents the result from specification (1) containing the standard variables posited by the literature and new determinants. It demonstrates the result for developed economies considering the relatively new determinant, i.e., commodity price, exchange rate stability and de jure capital openness along with the theoretically established determinants, e.g., real GDP growth rate, real effective exchange rate, net foreign assets and trade openness. Each coefficient has expected sign, and most of them are significantly different from zero. The coefficient of lagged dependent variable shows that the current account deficit in developed economies is persistent.

The real GDP growth rate (−0.174) has a significant negative influence on current account balance. This implies that increasing real GDP growth will amplify developed country’s higher income leading more consumption expenditure resulting negative impact on current account balance. This result is also confirmed by Glick and Rogoff (1995), Chinn and Prasad (2003), (Bussière et al. 2004) and Chinn and Ito (2007). Similarly, the real effective exchange rate is significantly negative, as expected, but is far smaller than unity (−0.019). This finding is supported by the previous works (Obstfeld and Rogoff 1995a; Herrmann and Jochem 2005) which demonstrates that increase in REER will decrease country’s savings. Because, it will appreciate the domestic currency, thereby influencing to purchase more important goods from abroad. Therefore, much spending on consumption will result in lowering savings ratio, which leads to lessen current account balance.

Commodity price index (−0.003) has exerted a negative influence on current account balance as well. Since, developed economies are largely manufacture exporter and commodity importer, so soaring of commodity price will increase the import value of commodity products which will widen the current account deficit. Although the coefficient is insignificant and very tiny in value, its right expected sign creates an insight to include this indicator. The net foreign assets plots show a positive relationship, which reveals that developed countries have relatively large stock of net foreign assets that will lead to large current account surplus. The coefficient estimated for trade openness impacts by 0.022. Alike, Chinn and Prasad (2003) and Chinn and Ito (2007) advocate the degree of openness to international trade could reflect tariff regime and other policy choice will have a positive effect on current account. Moreover, the positive impact of trade openness on the current account implies that economy with less trade restrictions and more exposure to international trade tends to be relatively more attractive to foreign capital. Thus, larger current account balance is associated with greater degree of trade openness.

The coefficient of the de jure capital openness captures negative impact (−0.32). As it is measured based on binary dummy which reflects cross-border financial transaction restriction, i.e., multiple exchange rate, current account transaction and capital account transaction reported in IMF’s AREAER (Chinn and Ito 2008). Accordingly, the coefficient implies that countries are more open for capital and financial transaction that would lead them a negative current account.

Exchange rate stability index in which value ranges from 0 (unstable) to 1 (stable) is measured by Aizenman et al. (2008). The estimator finds exchange rate stability effect of 2.17 with a 10 % significance level on the current account balance, meaning that capital will inflow in relatively stable exchange rate regime. In support with Aizenman et al. (2008), this result also finds a positive link in terms of developed country’s current account balance. Specification (2) discloses the determinants of current account imbalance for emerging countries. The sign of the determinants is counterintuitive with developed economies. Unlike developed economies, real GDP growth rate and commodity price index have shown positive impact at a 1 % significant level. As long as emerging economies are more cautious about their financial policy against Western exuberance in consumption and residential investment, massive export earnings help to boost up the current account surplus (Miller et al. 2011). Hence, the higher real GDP growth is more likely to increase their savings with less growing consumption. So, the higher real GDP growth rate steers the path of current account surplus. One of the striking results carrying from commodity price is the strong positive relationship with current account. However, the statistically significant coefficient captures a little positive impact. In fact, it gives a new message for current account since, emerging countries are primarily commodity exporters, and thus increasing commodity price will rise their export opportunities to the overseas.

On the other hand, net foreign assets and exchange rate stability have a statistically significant negative impact. Net foreign asset refers to total foreign assets minus total foreign liabilities; hence, the negative coefficient weigh the countries having more foreign liabilities record positive income flows. Next emerging economies’ exchange rate stability is measured by considering the USA as base country, and thus increasing exchange rate stability will not impact positively on emerging economies’ current account because of volatile US exchange rate. This result is also validated by Aizenman et al. (2008) for emerging economies. Similarly, real effective exchange rate, trade openness and de jure capital openness reflect the same magnitude on the current account likewise developed economies.

The results for the developing economies are shown in specification (3). The real GDP growth rate shows the similar negative impact at 1 % significance level which also matches with the findings of Chinn and Prasad (2003). The coefficients of real effective exchange, net foreign asset, de jure capital openness and exchange rate stability are also followed by negative impact. This reports that high net foreign asset increases the foreign flows, and as a result from an intertemporal approach it supports the theory. Similarly, the coefficient of the real effective exchange rate implies that increased REER will reduce the propensity to save and thus this causes a deficit current account balance. For exchange rate stability likewise emerging economies, it measures USA as a base country; therefore, volatility in exchange rate will lead negative impact even if developing economies’ stable exchange rate. Nevertheless, the coefficient of commodity price enters positively in current account which supports with the findings in terms of developing countries. Like emerging economies, developing economies are also primarily commodity exporter; thus, high commodity price accumulates high foreign earnings from export, which helps to improve the current account balance.

Lastly, specification (4) shows the result of full sample countries taking into account the same determinants. The sign and value of coefficients are quite dissimilar in comparison with different groups of countries. The result compactly shows that real effective exchange rate, net foreign asset, de jure capital openness and exchange rate stability are similar with emerging and developing economies.

However, to test the validity of the result the null hypothesis of Sargan and Hansen *J* tests are not rejected, which implies that the first difference instrumental variables are not correlated with error term. Hence, the instruments are valid for the estimation. Subsequently, the Arellano–Bond test supports that there is no serial correlation, which entails the null hypothesis is that the errors in the first difference regression exhibit no second-order serial correlation.

#### 6.3.2 System GMM estimation

Table 5 gives the full results of system GMM estimation. This analysis conducts the same explanatory variable set as it used in difference GMM technique. In addition, to get rid of the possible biases and imprecision associated with the difference GMM estimator, system GMM estimator combines the regression in difference with regression in levels. Under this system, this paper instrumented the net foreign assets and exchange rate stability to overcome the potential endogeneity which generates consistent and efficient parameters. The Sargan, Hansen, diff-in-Hansen and Arellano–Bond tests satisfy the validity of the instruments in the system GMM estimator.

The specification (1) to (4) has shown the coefficients are very close to those it obtained from the difference GMM estimator. For instance, commodity price index, real GDP growth, real effective exchange rate and trade openness have almost same coefficient for developed, emerging, developing and full samples as reported in the difference GMM result (Table 5), while net foreign assets, de jure capital openness and exchange rate stability have comparatively large impact in the system dynamic panel GMM result reported in Table 5 [specification (1)–(4)]. The sign and value of coefficients are quite similar in comparison with other specifications, i.e., developed, emerging and developing. As noted earlier, these coefficients suggest that the exogenous change in the determinants implies a large change in current account balance. Subsequently, the positive lagged dependent variable suggests the existence of significant dynamic effect on the current account balance.

The specification tests indicate that all models are well specified in terms of endogeneity and instruments validity. The row for Sargan and Hansen *J* tests (*p* value) reports that the null hypothesis of the over identifying restrictions is valid in all specifications. The *p*-*value* for diff-in-Hansen test suggests that additional moment conditions are valid for the system GMM model. Similarly, the Arellano–Bond test supports that there is no serial correlation, which entails the null hypothesis is that there are high first-order autocorrelation and no evidence for significant second-order serial correlation.

In summary, this paper gets the expected results which capture the some important determinants (commodity price, de jure and de facto capital openness and exchange rate stability) together with commonly used determinants in the literature such as net foreign asset, real effective exchange rate, trade openness and real GDP growth of current account balance. As difference GMM estimators are strongly downward biased, Blundell and Bond (1998) proposed system GMM estimators to mitigate this issue. Thus, in this research system GMM estimators show more consistent and unbiased results compared with the difference GMM. So, here it placed both results to show that how downward biased difference GMM estimators produce more inflated impact than system GMM estimator. Therefore, in this paper system GMM estimator shows the real impact which can be contributed to the theoretical and policy implication of global current account imbalance.

## 7 Robustness

Robustness checks (difference dynamic panel estimation)

(1) | (2) | (3) | (4) | |
---|---|---|---|---|

Developed | Emerging | Developing | Full sample | |

Lag CAB (% of GDP) | 0.684*** | 0.384*** | 0.615*** | 0.404*** |

(0.039) | (0.004) | (0.031) | (0.0009) | |

Real GDP growth rate | −0.156*** | 0.661*** | −0.0389*** | 0.366*** |

(0.023) | (0.035) | (0.009) | (0.002) | |

∆ REER | −0.0157*** | −0.059*** | −0.0008 | −0.003*** |

(0.004) | (0.003) | (0.001) | (0.0006) | |

Commodity price index | −0.003 | 0.0005 | 0.006*** | 0.002*** |

(0.004) | (0.004) | (0.001) | (0.0004) | |

Openness of trade | 0.007 | 0.164*** | 0.002 | 0.073*** |

(0.011) | (0.038) | (0.006) | (0.001) | |

de facto capital openness | −0.0002 | −0.004*** | −0.004** | −0.007** |

(0.0004) | (0.0003) | (0.001) | (0.0002) | |

Exchange rate stability index | 6.611** | −0.418 | −0.035 | −2.405*** |

(3.073) | (1.917) | (1.196) | (0.168) | |

Asian crisis dummy | 12.25 | −22.37* | – | 0.855 |

(7.649) | (12.63) | – | (1.114) | |

Sargan test ( | 0.121 | 0.191 | 0.214 | 0.192 |

Hansen | 0.172 | 0.178 | 0.227 | 0.219 |

A–B test | 0.032 | 0.041 | 0.004 | 0.001 |

A–B test | 0.483 | 0.482 | 0.490 | 0.477 |

Observations | 837 | 992 | 1457 | 3286 |

Number of countries | 27 | 32 | 47 | 106 |

Robustness checks (system dynamic panel estimation)

(1) | (2) | (3) | (4) | |
---|---|---|---|---|

Developed | Emerging | Developing | Full sample | |

Lag CAB (% of GDP) | 0.798*** | 0.400*** | 0.639*** | 0.405*** |

(0.031) | (0.007) | (0.028) | (0.0006) | |

Real GDP growth rate | −0.215*** | 0.798*** | −0.028** | 0.458*** |

(0.018) | (0.033) | (0.012) | (0.004) | |

∆ REER | −0.014*** | −0.091*** | −0.004** | −0.008*** |

(0.004) | (0.011) | (0.002) | (0.001) | |

Commodity price index | −0.005 | 0.009*** | 0.007*** | −0.004*** |

(0.003) | (0.003) | (0.001) | (0.0005) | |

Openness of trade | −0.004 | 0.042*** | −0.003 | 0.084*** |

(0.025) | (0.008) | (0.005) | (0.002) | |

de facto capital openness | 0.0001 | −0.002*** | −0.004*** | −0.006*** |

(0.0006) | (0.0001) | (0.001) | (0.0001) | |

Exchange rate stability index | 1.081 | −4.948** | 0.304 | −2.937*** |

(1.683) | (1.925) | (1.034) | (0.135) | |

Asian crisis dummy | 10.54* | −2.253* | – | 0.684 |

(6.071) | (18.74) | – | (0.612) | |

Sargan test ( | 0.193 | 0.214 | 0.197 | 0.221 |

Hansen | 0.172 | 0.178 | 0.227 | 0.219 |

Diff-in-Hansen test ( | 0.138 | 0.163 | 0.211 | 0.194 |

A–B test | 0.024 | 0.011 | 0.007 | 0.004 |

A–B test | 0.583 | 0.582 | 0.590 | 0.577 |

Observations | 837 | 992 | 1457 | 3286 |

Number of countries | 27 | 32 | 47 | 106 |

In Tables 6 and 7, this paper replaced the net foreign assent and de jure capital openness by Asian crisis dummy and de facto capital openness. By doing so, the effects of the contemporaneous determinants and lagged dependent variable are very similar for developed, emerging and developing economies group. Here, the de facto capital openness has negative effects similarly as de jure capital openness on current account in different country groups. Thus, the result confirms that there is no surprise change that obtained in the main specifications in Tables 4 and 5.

To sum up, all of global current account determinants (real GDP growth rate, net foreign assets, commodity price index, real effective exchange rate, trade openness, exchange rate stability and de facto capital openness) show the significant effect on current account balance. Besides, the specification tests (Sargan, Hansen *J*, diff-in-Hansen and Arellano–Bond tests) support the robustness check results. This implies that robustness results pass from endogeneity and serial correlation bias. Therefore, conclude that the estimated coefficients derived from the quantitative measures are robust.

## 8 Conclusion

The nature of current account imbalance, their importance and their potential path in the global economy have been taken a mainstream debate on the international macroeconomic outlook. This research examined the determinants of current account imbalance in global economy where, two econometric techniques to find the determinants empirically: first, difference GMM dynamic panel and, second, system GMM dynamic panel estimators. This study is specially designed to deal with the key problems of the past literature of the global current account imbalance, for instance omitted variable bias, endogeneity and simultaneity bias originating from unobserved country-specific effects. As a robustness check, this paper also used the same techniques with adjusted variables. The both results present the same story; the exogenous determinants have a strong impact on current account balance. In particular, current account balance has positive link with commodity price real GDP growth and trade openness in emerging economies, whereas negative link in developed economies. In contrast, it has a significant negative channel with net foreign assets, real effective exchange rate and exchange rate stability in terms of emerging economies and, on the other hand, a positive channel with these variables except real effective exchange rate. However, to overcome endogeneity, simultaneity and omitted variable bias the specification tests (Sargan, Hansen *J*, diff-in-Hansen and Arellano–Bond) support the estimated results.

Finally, this research reveals the implication of incorporating new determinants such as commodity price, exchange rate stability and de jure capital openness. Compacting this intuition, results support Chinn and Prasad (2003) and Chinn and ito (2007) analysis. Due to data limitation, however, this paper does not conduct the comprehensive evaluation of the net foreign asset and commodity price valuation, capital controls and international risk management, which is also very important to measure the global current account imbalance. Future work should considerably be widen and intense to understand the determinants in this context.

Lucas (1990) stressed the failure of standard neoclassical growth models to explain the movement of international capital flows. In fact, neoclassical models forecast capital flows from rich to poor countries while Lucas Paradox accounts for the dynamics of current account imbalances and uphill capital flows.

S&P indicates Standard & Poor’s Financial Services; FTSE indicates Financial Times Stock Exchange Group.

## Declarations

### Acknowledgements

The author thanks anonymous referee.

### Competing interests

The author declares that he has no competing interests.

**Open Access**This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

## Authors’ Affiliations

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