This article explores subjects in optimal income taxation characterized by recent research interest, practical importance in light of concerns about inequality, potential for misunderstanding, and prospects for advancement. Throughout, the analysis highlights paths for further investigation....

Products with negative externalities are often subject to regulations that limit competition. The single-product case may suggest that it is irrelevant for aggregate welfare whether output is restricted via corrective taxes or limiting competition. However, when products are differentiated...

What is a feasible and efficient policy to regulate air pollution from vehicles? A Pigouvian tax is technologically infeasible. Most countries instead rely on exhaust standards that limit air pollution emissions per mile for new vehicles. We assess the effectiveness and efficiency of these...

This paper asserts that reporting of the ratio of welfare gains to tax revenue should be standard protocol in economic analyses of externality correcting taxes. That this comparison might matter is somewhat of a "blind spot" in most economic analyses, for it plays virtually no role when...

I argue for thinking of program evaluation as a decision problem. In the context of California's GAIN experiment (a randomized trial of a welfare-to-work alternative to AFDC), I show that GAIN first-order stochastically dominates AFDC when considering the choice between the treatment and control...

I review evidence on alternative labor market policies that could potentially improve economic self-sufficiency via mandating higher wages, subsidizing employment, or increasing productivity. The evidence indicates that the minimum wage is an ineffective policy to promote economic...

The Personal Responsibility and Work Opportunity Reconciliation Act imposed work requirements on welfare recipients. Using 1999-2001 data from Boston, Chicago, and San Antonio, we compared the labor market and welfare experience of women with four employment barriers: poor mental health,...

In this paper, we explore ways of combining experimental data and non-experimental methods to estimate the differential effects of components of training programs. We show how data from a multi-site experimental evaluation in which subjects are randomly assigned to any treatment versus a control...

A disproportionate share of low-skilled U.S. workers is employed by temporary-help firms. These firms offer rapid entry into paid employment, but temporary-help jobs are typically brief, and it is unknown whether they foster longer-term employment. We exploit a unique aspect of the city of...