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This article examines how the increase in the incarceration of black men and the sex ratio imbalance it induces shape the behavior of young black women. Combining data from the Bureau of Justice Statistics and the Current Population Survey to match male incarceration rates with individual observations over two decades, I show that black male incarceration lowers the odds of black nonmarital teenage fertility while increasing young black women's school attainment and early employment. These results can account for the sharp bridging of the racial gap over the 1990s for a range of socioeconomic outcomes among females.

There is a long-standing literature that recognizes that an efficient solution in correcting a consumption externality is through applying subsidies and taxes that line up private incentives with social ones. An equally long-standing literature tackles the appropriate methods of generating the efficient amount of R&D into goods that only have private consumption effects, e.g. the analysis of the welfare effects of patent regulations. This paper analyzes the joint problem of the optimal provision of R&D and consumption incentives for goods that at the same time undergo technological change and have external consumption effects. For good with external effects, just as is the case for goods with only private effects, ex-post static efficiency may have to be sacrificed for dynamic efficiency. For goods with only private consumption effects, it is well-understood that efficient competition ex-post leads to insufficient R&D incentives ex-ante, which is of course the common rationale for patents. For external effects, this analogy has the important and unrecognized implication that classic interventions to solve externality problems, such as Pigouvian taxes and subsidies, may often be inefficient under technological change. In many cases, arguing for Pigouvian solutions in presence of technological change is analogous to arguing for competitive markets for new inventions (!), as both argue for ex-post efficiency rather than dynamic efficiency. The results are discussed in the context of the pharmaceutical industry which simultaneously is one of the most R&D-intensive industries and one for which consumption of its output often seems to involve external effects, e.g. through human rights-based access issues.

This article explores key insights that economic theory can shed on the issue of no-fault divorce in the United States, addressing modifications in the incentive structure of individuals that resulted from the legislative reforms of the 1970s. After stressing the importance of correctly interpreting and classifying divorce laws, this work investigates the contributions of the theory of property rights, the contributions of game theory and intra-household bargaining, and the contributions of general equilibrium analysis in our understanding of how divorce laws work and what their impact is. By doing so, this exposé analyzes the theoretical consequences of no-fault divorce on the decision whether to get married or divorced, on the characteristics of spouses and divorcees, on divorce rates, and on marital-specific and non marital-specific investments. Copyright Springer Science+Business Media, Inc. 2005divorce, no-fault, marriage, marital investments, incentives, B4, D1, K3,

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