This note presents a simple model of Hirschman and Rothschild’s (1973) tunnel effect, which is generally interpreted as reducing inequality aversion. The model identifies two separate tunnel effects, associated with own-sector and inter-sector productivity shocks, that are closely related to...

After a decade of research, the effect of inequality on long-run economic growth remains unresolved, in part because researchers have treated omitted variable bias as an estimation problem rather than a deeper question of causality. In this article we argue that the key omitted variable is the...