  Acemoglu and Johnson (2007) put forward the unprecedented view that health
improvement has no significant effect on income growth. To arrive at this
conclusion, they constructed predicted mortality as an instrumental variable
based on the WHO international disease interventions to analyse this problem. I
replicate the process of their research and eliminate some biases in their
estimate. In addition, and more importantly, we argue that the construction of
their instrumental variable contains a violation of the exclusion restriction
of their instrumental variable. This negative correlation between health
improvement and income growth still lacks an accurate causal explanation,
according to which the instrumental variable they constructed increases reverse
causality bias instead of eliminating it.
