Knowledge that Transforms

Using multiple data sets from different time periods, we document declines in academic time investment by full-time college students in the United States between 1961 and 2003. Full-time students allocated 40 hours per week toward class and studying in 1961, whereas by 2003, they were investing about 27 hours per week. Declines were extremely broad based and are not easily accounted for by framing effects, work or major choices, or compositional changes in students or schools. We conclude that there have been substantial changes over time in the quantity or manner of human capital production on college campuses.

Can terrorist attacks be timed to change the outcome of democratic elections? In this paper, we analyze the electoral impact of the terrorist attacks of March 11, 2004, in Madrid. Studies using individual level postelectoral survey data reach contradictory conclusions. We propose an alternative approach. Since the bombings took place only three days before the 2004 congressional election, we can find a control group of individuals who cast their vote before the terrorist attacks. The results indicate that the attacks had an important electoral impact, rejecting the hypothesis that the identity of the winner was unaffected by the terrorist attacks.

Providing remedial (also known as developmental) education is the primary way colleges cope with students who do not have the academic preparation needed to succeed in college-level courses. Remediation is widespread, with nearly one-third of entering freshmen taking remedial courses at an annual cost of at least $1 billion. Despite its prevalence, there is uncertainty surrounding its short- and longer-run effects. This paper presents new evidence on this question using longitudinal administrative data from Texas and a regression discontinuity research design. We find little indication that remediation improves academic or labor market outcomes.

This paper estimates the economic effects of a recent reform that simplified business entry regulation in Mexico. The reform was introduced in different municipalities at different points in time. Using microlevel data, I find that the reform increased the number of registered businesses by 5%. This increase was due to former wage earners' opening businesses. Former unregistered business owners were not more likely to register their business after the reform. The reform also increased wage employment by 2.2%. Finally, the results imply that the competition from new entrants decreased the income of incumbent businesses by 3%.

I estimate the impact of hurricane strikes on local economic growth rates. To this end, I assemble a panel data set of U.S. coastal counties' growth rates and construct a novel hurricane destruction index that is based on a monetary loss equation, local wind speed estimates derived from a physical wind field model, and local exposure characteristics. The econometric results suggest that a county's annual economic growth rate falls on average by 0.45 percentage points, 28%% of it due to richer individuals moving away from affected counties. I also find that the impact of hurricanes is netted out in annual terms at the state level and does not affect national economic growth rates at all.

Most academic and development policy discussions about microentrepreneurs focus on credit constraints and assume that subject to those constraints, the entrepreneurs manage their business optimally. Yet the self-employed poor rarely have any formal training in business skills. A growing number of microfinance organizations are attempting to build the human capital of microentrepreneurs in order to improve the livelihood of their clients and help further their mission of poverty alleviation. Using a randomized control trial, we measure the marginal impact of adding business training to a Peruvian group lending program for female microentrepreneurs. Treatment groups received thirty- to sixty-minute entrepreneurship training sessions during their normal weekly or monthly banking meeting over a period of one to two years. Control groups remained as they were before, meeting at the same frequency but solely for making loan and savings payments. We find little or no evidence of changes in key outcomes such as business revenue, profits, or employment. We nevertheless observed business knowledge improvements and increased client retention rates for the microfinance institution.

The front matter of the April 2011 issue contains the Table of Contents

The front matter of the June 2011 issue contains the Table of Contents

The front matter of the May 2011 issue contains the Table of Contents