We show that the ‘skill-bias’ of a country’s tariff structure is positively correlated with long-term per capita GDP growth. Testing for causal mechanisms, we find evidence consistent with the existence of real benefits from tariffs focused in skill-intensive industries....

This paper examines the effect of U.S. food aid on conflict in recipient countries (these include Asian countries like Afghanistan, Sri Lanka). To establish a causal relationship, time variation in food aid is exploited which is caused by fluctuations in U.S. wheat production together with...

In this paper regional variation in suitability for cultivating potatoes, together with time variation arising from their introduction to the Old World from the Americas is being exploited, to estimate the impact of potatoes on Old World population and urbanization. Their results show that the...