Long run economic growth goes along with structural change. Recent work has identified explanatory factors on the demand side (non-homothetic preferences) and on the supply-side, in particular differential productivity growth across sectors and differences in factor proportions and capital...

Ranking development programs using integrals of discounted utilities can yield drastic consequences that offend our sense of justice. New alternative social welfare criteria should be considered. A reaction to discounted utilitarianism is to moderate its effects by adding to the social welfare...

There is a growing interest in multi-sector models that combine aggregate balanced growth, consistent with the well-known Kaldor facts, with systematic changes in the relative importance of each sector, consistent with the Kuznets facts. Although variations in the income elasticity of demand...

Recent empirical research has documented the importance of shocks to firmspecific productivity, but has provided only limited evidence on their sources. This paper proposes and analyzes purposeful experimentation by firms as a source of such shocks and models industry dynamics in such a setting....

Why do some people become entrepreneurs, how do institutions affect this choice, and how does this affect the firm size distribution and aggregate productivity? This paper addresses this question using a matching model with occupational choice and heterogeneity in both ability as a worker and ex...

Why do some people become entrepreneurs (and others don't)? Why are firms so heterogeneous, and many firms so small? To start, the paper briefly documents evidence from the empirical literature that the relationship between entrepreneurship and education is Ushaped; that many entrepreneurs start a...

How and why does the firm size distribution differ across countries? This paper documents that features of the firm size distribution are strongly associated with income per capita. Richer countries have fewer entrepreneurs and fewer small firms. The average, dispersion and skewness of firm size...