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If rational individuals pay the full costs of their decisions about food intake and exercise, economists, policy makers, and public health officials should treat the obesity epidemic as a matter of indifference. In this paper, we show that, as long as insurance premiums are not risk rated for obesity, health insurance coverage systematically shields those covered from the full costs of physical inactivity and overeating. Since the obese consume significantly more medical resources than the non-obese, but pay the same health insurance premiums, they impose a negative externality on normal weight individuals in their insurance pool.

To estimate the size of this externality, we develop a model of weight loss and health insurance under two regimes – (1) underwriting on weight is allowed and (2) underwriting on weight is not allowed. We show that under regime (1), there is no obesity externality. Under regime (2), where there is an obesity externality, all plan participants face inefficient incentives to undertake unpleasant dieting and exercise. These reduced incentives lead to inefficient increases in bodyweight, and reduced social welfare.

Using data on medical expenditures and bodyweight from the National Health and Interview Survey and the Medical Expenditure Panel Survey, we estimate that, in a health plan with a coinsurance rate of 17.5%, the obesity externality imposes a welfare cost of about $150 per capita. Our results also indicate that the welfare loss can be reduced by technological change that lowers the pecuniary and non-pecuniary costs of losing weight, and also by increasing the coinsurance rate.

This chapter provides a formal analysis of the economic welfare effects for large and small partners to free trade agreements. Michaely (1998) has demonstrated that large country welfare is U-shaped in the small country's size. I derive the welfare for the large country for all possible small country sizes, and show that the maximum possible loss for the large country is twice its tariff revenue. I identify the data necessary to estimate the welfare effects and consider how initial trade volumes, tariffs, and international price differences affect the large country's welfare.

In this paper we look at patents as alternative to trade secrets. We disentangle the disclosure motive for patent protection from the traditional reward motive by adjusting the level of patent protection so as to make the innovator just indifferent between patenting and keeping the innovation secret. Thus, we keep the reward (expected profits) to the innovator fixed and focus on ex post efficiency. When duplication is not feasible and secrecy only entails the risk of public disclosure (a leakage), patents and secrets are perfect substitutes. Yet, a distinctive features of trade secret protection is that it allows for independent creation. The duplicative efforts to reproduce a concealed innovation make patents and secrets imperfect substitutes. If such duplicative efforts are actually exerted under secrecy, patents provide the pre-specified incentive to innovate at least social cost. If, however, the threat of duplication induces the innovator to preemptively license her trade secret, and such licensing agreements allow the innovator to appropriate all the saved duplication costs, then secrets can reward innovative activity more efficiently than patents. Thus, the issue of whether patents are socially preferable to secrets boils down to an assessment of the prevalence and the efficiency of trade secret licensing. The available empirical evidence suggests that licensing of trade secret information is limited and so hints at the superiority of patents.

We use simulations from a detailed dynamic computable general equilibrium (CGE) model to study three broad policies toward illegal workers in U.S. employment: supply restriction (tighter border security), demand restriction (prosecution of employers), and legalization through a guest-worker program with a visa tax. From the point of view of the welfare of legal residents, the results strongly favor the third option. In our welfare analysis, we use a six-part decomposition. This identifies effects on the occupational mix of legal employment as a major factor. Throughout the chapter, model results are explained through arguments and diagrams that will be familiar to economists, particularly those working in trade. No familiarity with the underlying CGE model is assumed. Technical details on our labor market assumptions are given in the Appendix.

Using matched data from the 1996 to 2004 Current Population Survey (CPS), we examine racial patterns in annual transitions into and out of health insurance coverage. We first decompose racial differences in static health insurance coverage rates into group differences in transition rates into and out of health insurance coverage. The low rate of health insurance coverage among African-Americans is due almost entirely to higher annual rates of losing health insurance than whites. Among the uninsured, African-Americans have similar rates of gaining health insurance in the following year as whites. Estimates from the matched CPS also indicate that the lower rate of health insurance coverage among Asians is almost entirely accounted for by a relatively high rate of losing health insurance. In contrast to these findings, differences in health insurance coverage between Latinos and whites are due to group differences in both the rate of health insurance loss and gain. Using logit regression estimates, we also calculate nonlinear decompositions for the racial gaps in health insurance loss and gain. We find that two main factors are responsible for differences in health insurance loss between working-age whites and minorities: job loss and education level. Higher rates of job loss account for 30 percent of the health insurance gap for African-Americans and Asians, and 16 percent of the health insurance gap for Latinos. Lower levels of education explain roughly 15 percent of the gap for African-Americans and Latinos (Asians' higher levels of education serve to close the gap). Higher rates of welfare and SSI participation among African-Americans also serve to widen the gap in health insurance loss by 8 percent.

This chapter reviews the key results obtained in previous studies of airline mergers. It is found that the effect of mergers on airfares is dependent on the network configurations of merging airlines. Fare increases are frequently observed on overlapped routes. However, if the networks of two merging airlines are complementary, the expanded network after the merger leads to cost savings, increase in travel options, and improvement in service quality. Therefore, in a deregulated market, with few entry barriers, relaxing merger regulations is likely to improve welfare. However, most welfare evaluations do not incorporate quality changes or dynamic competition effects. Empirical investigations are primarily ex post analysis of mergers that have already passed antitrust reviews. The relationship between market concentration and welfare might be nonlinear and market specific. Therefore, airline mergers and alliances should be reviewed case by case. Methodological improvements are needed in future studies to control for the effects of complicating factors inherent in ex post evaluations.

Following the World Trade Organization (WTO) ruling favoring Brazil over U.S. cotton growers, the debate continues over the impact of U.S. farm policy. For U.S. cotton policy, the price impact depends on several factors, including the extent to which it is decoupled from production. The impact on world cotton prices under decoupling (the loan rate is used in supply response analysis) is much less than under coupling (the target price is used in producer production decisions). Also, the welfare impacts are very different. Using cotton as an example, the welfare cost of U.S. cotton policy is much less under a decoupled program.

This chapter reviews the economics literature on the development aspects of a substantially strengthened global regime of intellectual property rights (IPR). In this regime developing countries must adopt tighter standards governing patents, copyrights, and related policies, in order to protect global innovation. Some analytical literature finds that these changes could improve prospects for technology flows to poor countries, helping to integrate them into the global knowledge economy. Other authors raise deep concerns about whether these policy shifts will restrict growth through raising the costs of imitation, innovation, and acquiring international technologies. Poor countries may face permanently higher costs, raising questions about both the efficiency and equity implications. The chapter considers first the role of a balanced IPR regime in an overall economic development policy. This balance could involve widely varying protection standards at differing levels of economic development, growth, and social preferences. This situation is especially true in the world economy, where poorer countries may prefer to free ride on available international technologies. Much of the theoretical literature takes this view, suggesting that harmonized global policies could reduce innovation and growth. More recent literature takes a broader view of the ability of IPR to build global technology markets and support international information exchanges. Ultimately these are empirical questions and the available literature differs considerably in analytical approaches and conclusions. Thus, the chapter analyzes contributions from theory, empirical analysis, and case studies regarding prospective improvements or impediments to economic development arising from IPR reforms. These issues are especially important in public health and nutrition. The chapter concludes with an overview of how the globalized nature of IPR protection could affect developing countries. The essential point is that policy governing patents and copyrights needs to be embedded effectively in an overall economic development strategy.