Research on insurgency has been invigorated this past decade by better data, improved methods, and the urgency of understanding active engagements in Iraq and Afghanistan. This empiricists’ insurgency reinforces a classic literature on the essential role of civilians while challenging older...

One of the great puzzles of Sub-Saharan African economic history is that wheeled transportation was barely used prior to the colonial period. Instead, head porterage was the main method of transportation. The consensus among historians is that this was a rational adaption to the underlying...

There are two obvious possibilities that can account for the rise in productivity during recent recessions. The first is that the decline in the workforce was not random, and that the average worker was of higher quality during the recession than in the preceding period. The second is that each...

We estimate a dynamic learning model of the college dropout decision, taking advantage of unique expectations data to greatly reduce our reliance on assumptions that would otherwise be necessary for identification. We find that forty-five percent of the dropout that occurs in the first two...

We analyze the early labor market outcomes of U.S. college graduates from the classes of 1974 to 2011, as a function of the economic conditions into which they graduated. We have three main findings. First, poor labor market conditions substantially disrupt early careers. A large recession at...

Two recent meta-analyses use variants of the Baily, Hulten, and Campbell (1992) (BHC) decompositions to ask whether recent robust growth in Aggregate Labor Productivity (ALP) across twenty-five countries is due to lower barriers to input reallocation. They find weak gains from measured...

One of the most wide-ranging reforms in public education in the last decade has been the reorganization of large comprehensive high schools into small schools with roughly 100 students per grade. We use assignment lotteries embedded in New York City's high school match to estimate the effects of...

The rising importance of Information Technology (IT) occupations in the U.S. economy has been accompanied by an expansion in the representation of high-skill foreign-born IT workers. To illustrate, the share of foreign born in IT occupations increased from about 15.5% to about 31.5% between 1993...

In this paper, we formulate a model of early childhood development in which mothers have subjective expectations about the technology of skill formation. The model is useful for understanding how maternal knowledge about child development affects the maternal choices of investments in the human...

Projected demographic changes in industrialized and developing countries vary in extent and timing but will reduce the share of the population in working age everywhere. Conventional wisdom suggests that this will increase capital intensity with falling rates of return to capital and increasing...