Does the fourth entrant make any difference?: Entry and competition in the early U.S. broadband market

We study the importance of sunk costs in determining entry conditions and inferences about firm conduct in an adapted Bresnahan and Reiss (1991, 1994) framework. In our framework, entrants incur sunk costs to enter, while incumbents disregard these costs in deciding on continuation or exit. We apply this framework to study entry and competition in the local U.S. broadband markets from 1999 to 2003. Ignoring sunk costs generates unreasonable variation in firms' competitive conduct over time. This variation disappears when entry costs are allowed. Once the market has one to three incumbent firms, the fourth entrant has little effect on competitive conduct.     

Macrodynamic Implications of Income-Transfer Policies for Human Capital Investment and School Effort

The distortion in educational investment in poorer childrenis often attributed to credit market imperfections and henceto the unequal access of children to educational opportunity.However, the distortion might also be attributable to disincentiveeffects that cause children to make inefficient use of educationalopportunities. This possibility is demonstrated for an overlappinggenerations economy with multiple family dynasties in which childrenhave random unobservable abilities and base their school efforton their parents after-tax returns to schooling. Income redistributioncan result in suboptimal effort choices that offset the beneficialeffects of income transfers and sharply lower social welfare.     

Can Private School Subsidies Increase Enrollment for the Poor? The Quetta Urban Fellowship Program

This study evaluates a program designed to stimulate girls'schooling through the creation of private girls' schools inpoor urban neighborhoods of Quetta, Pakistan. Enrollment growthin these randomly selected neighborhoods is compared to enrollmentgrowth in otherwise similar neighborhoods that were randomlyassigned to a control group. The analysis indicates that theprogram increased girls' enrollment around 33 percentage points.Boys' enrollment rose as well, partly because boys were allowedto attend the new schools and partly because parents would notsend their girls to school without also educating their boys.This outcome suggests that programs targeted at girls can alsoinduce parents to invest more in their boys. The success ofthe program varied across neighborhoods, although success wasnot clearly related to the relative wealth of a neighborhoodor to parents' level of education. Thus the program offers tremendouspromise for increasing enrollment rates in other poor urbanareas.     

Measuring the Impact of Meat Packing and Processing Facilities in Nonmetropolitan Counties: A Difference-in-Differences Approach

Considerable controversy exists regarding the costs and benefits of growth in the meat packing and processing industry for rural counties. This study investigates the effects of this industry on social and economic outcomes in nonmetropolitan counties of 23 Midwestern and Southern states from 1990 to 2000. Results suggest that as the meat packing industry's share of a county's total employment and wage bill rises, total employment growth increases. However, employment growth in other sectors slows, as does local wage growth. Industry growth has little impact on local crime rates or on growth of government spending on education, health, or police protection.     

O‐Ring production on U.S. hog farms: joint choices of farm size,technology, and compensation

We hypothesize that hog production can be characterized by complementarities between new technologies, worker skills, and farms size. Such production processes are consistent with Kremer's O‐ring production theory in which a single mistake in any one of several complementary tasks in a firm's production process can lead to catastrophic failure of the product's value. In hog production, mistakes that introduce disease or pathogens into the production facility can cause a total loss of the herd. Consistent with predictions derived from the O‐ring theory, we provide evidence that the most skilled workers concentrate in the largest and most technologically advanced farms and are paid more than comparable workers on smaller farms. These findings suggest that worker skills, new technologies, and farm size are complements in production. The complementarities create returns to scale to large hog confinements, consistent with the dramatic increase in market share of very large farms over the past 20 years.     

The scarring effects of youth joblessness in Sri Lanka

Retrospective data on labor market spells for successive cohorts of youth in the school‐to‐work transition in Sri Lanka are used to examine whether early spells of joblessness lead to subsequent difficulty in finding or keeping a job. A balancing score approach is used to generate pairs of youth in the school‐to‐work transition who have similar expected levels of joblessness but who differ in realized levels of joblessness. Assuming that youth are not able to perfectly control whether they are employed or not employed, we argue that marginal differences in joblessness among otherwise observationally equivalent youth can be viewed similarly to a regression discontinuity in experienced joblessness. We find evidence of scarring in that spending the first year after leaving school without a job or training increases subsequent share of time spent jobless by 23–31 percentage points and lowers subsequent wages by 5.5%–7.5%.     

Entrepreneurship over the business cycle

The fraction of self-employed rises in recessions because wage work is more sensitive than self-employment to the business cycle, not because of necessity entrepreneurship. Graduating during a recession reduces the probability of starting a business for the next 11 years.     

Prices and Health: Identifying the Effects of Nutrition, Exercise, and Medication Choices on Blood Pressure

Biomedical studies suggest that a person's behavior matters to health, but these studies usually treat human choice as exogenous. This study shows that individual choices on nutrient intake, exercise, and use of medication are influenced by exogenous food prices, wages, and non–labor income. Using these exogenous variables as instruments for endogenous behavior makes a big difference in the estimated impact of nutrient intake, exercise, and medication on blood pressure. For example, application of instrumental variables methods changes the impact of sodium on blood pressure from positive to negative and significant.     

The Effects of Housing Prices, Wages, and Commuting Time on Joint Residential and Job Location Choices

An empirical model of joint decisions of where to live and where to work demonstrates that individuals make residential and job location choices by trading off wages, housing prices, and commuting costs. Wages are higher in metropolitan markets, but housing prices are also higher in urban areas. Consumers can live in lower priced nonmetropolitan houses and still earn urban wages, but they incur commuting costs that increase with distance from the city. Improvements in transportation that lower commuting time will increase nonmetropolitan populations and will increase the number of nonmetropolitan commuters to metropolitan markets. Equal wage growth across labor markets causes a shift in relative population from rural to urban markets, while an equiproportional increase in housing prices causes a population shift toward rural areas.     

Child Labor and School Achievement in Latin America

Child labor’s effect on academic achievement is estimatedusing unique data on third and fourth graders in nine Latin-Americancountries. Cross-country variation in truancy regulations providesan exogenous shift in the ages of children normally in thesegrades, providing exogenous variation in the opportunity costof children’s time. Least squares estimates suggest thatchild labor lowers test scores, but those estimates are biasedtoward zero. Corrected estimates are still negative and statisticallysignificant. Children working 1 standard deviation above themean have average scores that are 16 percent lower on mathematicsexaminations and 11 percent lower on language examinations,consistent with the estimates of the adverse impact of childlabor on returns to schooling.