“…Since transaction costs appear to be persistent and tend to change very slowly over time, there are significant reasons to believe that potentially time‐varying instruments predicting the level of transaction costs reflect many other growth‐confounding changes beyond the legal rules (Helland & Klick, ). Many instrumental variables used to address the endogeneity of institutional variables do not provide time‐varying year‐to‐year changes such as colonial settler mortality rates (Acemoglu et al., ), population density in the year 1500 (Acemoglu et al., ), ethnic fractionalization (Mauro, ), factor and resource endowments (Easterly & Levine, ), the presence of historical gold mines (Acemoglu, García‐Jimeno, & Robinson, ), the prevalence of toxoplasma gondii (Maseland, ), the presence of colonial state (Acemoglu, Garcia‐Jimeno, & Robinson, ; Acemoglu, Naidu, Restrepo, & Robinson, ), and pre‐colonial genetic diversity (Faria, Montesinos‐Yufa, Morales, & Navarro, ) among several others. Our instrumental variables follow a similar logic.…”