How much innovation will be needed to meet the United Nations' Sustainable Development Goals? We model shifts in the cross-country relationship between GDP per capita and achievement in key development indicators as “technological gains” and convergence to the best performers at a given...

Since 2001, an aid consortium known as Gavi has accounted for over half of vaccination expenditure in the 75 eligible countries with an initial per capita GNI below $1,000. Regression discontinuity (RD) estimates show aid significantly displaced other immunization efforts and failed to increase...

The last 10 years has seen an explosion in cross country econometric studies of growth, driven by two factors---new mathematical models of the growth process that lend themselves to econometric testing, and new data sets that make such testing possible. This paper looks at a selective review of...