Knowledge that Transforms

Increasing mother’s labor supply during a child’s preschool years may reduce time investments, yielding a negative direct effect on midchildhood and teenage outcomes. But as mother’s work hours increase, income will rise. Can income compensate for the negative effect of hours? Our mediation analysis exploits exogenous variation in both mother’s hours and family income. Results suggest a negative, insignificant direct effect from increasing mother’s hours on child test scores. However, the positive mediating effect of income creates a positive total effect on test scores (26% of a standard deviation) for a 10-hour increase in mother’s weekly hours in preschool years.

This paper studies learning among coworkers when incentives change. We use a simple principal-agent model to show that when workers are not fully informed on the global shape of the production function, (1) their effort choice changes over time as information is disclosed and processed and (2) changing incentives can trigger this learning process. We test this prediction using personnel data from an egg production plant in Peru. Exploiting a sudden change in the contract parameters, we find that workers learn from each other over the shape of the production function. This adjustment process is costly for the firm.

Workfare can impact child development by inducing parents to spend less time at home. I study the mechanisms by which workfare policies affect children using the New Hope workfare experiment. The program randomly assigned individuals to a policy bundle including income and childcare subsidies conditional on full-time work. For families with young children, the program had positive effects on child academic performance and classroom behavior. Counterfactual experiments from a dynamic discrete choice model indicate that most of the effect of New Hope on young children is explained by parents enrolling their children in center-based childcare.