Knowledge that Transforms

During 1984–1996, welfare and tax policy were changed to encourage work by single mothers. The Earned Income Tax Credit was expanded, welfare benefits were cut, welfare time limits were added, and welfare cases were terminated. Medicaid for the working poor was expanded, as were training programs and child care. During this same time period there were unprecedented increases in the employment and hours of single mothers. We show that a large share of the increase in work by single mothers can be attributed to the EITC and other tax changes, with smaller shares for welfare benefit cuts, welfare waivers, training programs and child care programs.

Classroom education has public good aspects. The technology is such that when one student disrupts the class, learning is reduced for all other students. A disruption model of educational production is presented. It is shown that optimal class size is larger for better-behaved students, which helps explain why it is difficult to find class size effects in the data. Additionally, the role of discipline is analyzed and applied to differences in performance of Catholic and public schools. An empirical framework is discussed where the importance of sorting students, teacher quality, and other factors can be assessed.

This paper analyzes the impact of automatic enrollment on 401(k) savings behavior. We have two key findings. First, 401(k) participation is significantly higher under automatic enrollment. Second, a substantial fraction of 401(k) participants hired under automatic enrollment retain both the default contribution rate and fund allocation even though few employees hired before automatic enrollment picked this particular outcome. This “default” behavior appears to result from participant inertia and from employee perceptions of the default as investment advice. These findings have implications for the design of 401(k) savings plans as well as for any type of Social Security reform that includes personal accounts over which individuals have control. They also shed light more generally on the importance of both economic and noneconomic (behavioral) factors in the determination of individual savings behavior.

This paper proposes an experimental approach to studying different aspects of discrimination. We let participants play various games with opponents of distinct ethnic affiliation. Strategies based upon such ethnic affiliation provide direct evidence of ethnic discrimination. This approach was utilized to study ethnic discrimination in Israeli Jewish society. Using the “trust game,” we detected a systematic mistrust toward men of Eastern origin. A “dictator game” experiment indicated that this discrimination was due to (mistaken) ethnic stereotypes and not to a “taste for discrimination.” The “ultimatum game” enabled us to trace another ethnic stereotype that reversed the discrimination's direction. One of the surprising results is that this ethnic discrimination is an entirely male phenomenon.

School finance equalization has probably affected American schools more than any other reform of the last 30 years. Understanding it is a prerequisite for making optimal social investments in human capital. Yet, it is poorly understood. In this paper I explain why: it differs from conventional redistribution because it is based on property values, which are endogenous to schools' productivity, taste for education, and the school finance system itself. I characterize equalization schemes and show why some "level down" and others "level up." Schemes that strongly level down have unintended consequences: even poor districts can end up worse off. I also show how school finance equalization affects property prices, private school attendance, and student achievement.

The majority of U. S. temporary help supply (THS) firms offer nominally free, unrestricted computer skills training, a practice inconsistent with the competitive model of training. I propose and test a model in which firms offer general training to induce self-selection and perform screening of worker ability. The model implies, and the data confirm, that firms providing training attract higher ability workers yet pay them lower wages after training. Thus, beyond providing spot market labor, THS firms sell information about worker quality to their clients. The rapid growth of THS employment suggests that demand for worker screening is rising.

There has been a dramatic change in the division of responsibility between the state and the private sector for the delivery of public goods and services in recent years with an increasing trend toward contracting out to the private sector and “public-private partnerships.” This paper analyzes how ownership matters in public good provision. We show that if contracts are incomplete then the ownership of a public good should lie with a party that values the benefits generated by it relatively more. This is true regardless of whether this party is also the key investor, or other aspects of the technology.

We study gender differences in altruism by examining a modified dictator game with varying incomes and prices. Our results indicate that the question “which is the fair sex?” has a complicated answer—when altruism is expensive, women are kinder, but when it is cheap, men are more altruistic. That is, we find that the male and female “demand curves for altruism” cross, and that men are more responsive to price changes. Furthermore, men are more likely to be either perfectly selfish or perfectly selfless, whereas women tend to be “equalitarians” who prefer to share evenly.