Correction to: Economic Structures (2021) 10:12 https://doi.org/10.1186/s40008‑021‑00242‑8
The original version of this article (Flegg et al. 2021) unfortunately contained an error in the presentation of two equations. The correct versions are given in this erratum.
Also, on the same page, the 2DLQ method is, in two instances, erroneously referred to as the 2DLS method.
The original article has also been corrected.