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This paper analyzes how the ability to limit cooperation influences the outcome of complete information bargaining between two players. When cooperation involves prompt resolution of a conflict, as in alternating-offer games and wars-of-attrition, the solutions equate the marginal rates of substitution between earlier resolution and more private goods. When cooperation involves consent for the level of a public good, the outcome again equates the marginal rates of substitution between greater cooperation (more public good) and more private goods (lower cost shares). Here, the equilibrium consists of balanced linear cost shares given by the ratio of marginal-willingness-to-pay to marginal cost.

Using microdata from the Luxembourg Income Study, we assess “time crunch” for families with children in Canada, Germany, Sweden, the U.K. and the U.S. Both theory and empirical evidence suggest that both time and money are important inputs to the well-being of parents and children. We present cross-country comparisons of “total available adult hours” under different assumptions about the varying time needs of families of different size. We also present estimates of “time shortages.” In all cases, we provide separate estimates for families located at different points in the country income distributions, since being short of both time and money is likely to be particularly problematic. Although paid work hours are highest for high-income families, we nonetheless find significant numbers of lower-income families in which parents work very long hours in the paid labor market; this is particularly the case in the U.S.

The goal of this paper is to compare the extent of child obesity in Canada, Norway and the United States. As child poverty is an important correlate of child obesity, we wish to examine the potential role of international differences in child poverty in explaining international differences in the extent of child obesity. We use three representative microdata surveys containing parental reports of child height and weight collected in the mid-1990s in Canada, Norway and the US. We calculate both the prevalence and proportional severity of child obesity for 6-11-year-old children in each country, and represent the 'extent' of obesity diagrammatically. Differences in patterns of child poverty are similarly depicted. Obesity extent is also compared for poor and non-poor children in Canada and the US. Finally, child obesity in the three countries is compared using only non-poor children where we find that the extent of child obesity is much lower in Norway than in Canada or the US. The pattern apparent for obesity is remarkably similar to that found for child poverty. In Canada and especially in the US, we find a much greater extent of obesity for poor than non-poor children. However, when we compare only non-poor children in the three countries, although the magnitude of difference is smaller, it remains clear that Norwegian children are much less likely to be obese. Policy and research directed towards reducing the extent of child obesity in both Canada and the US should pay particular attention to issues of child poverty.

African trypanosomes are unicellular parasites that use DNA recombination to evade the mammalian immune response. They do this in a process called antigenic variation, in which the parasites periodically switch the expression of VSG genes that encode distinct Variant Surface Glycoprotein coats. Recombination is used to move new VSG genes into specialised bloodstream VSG transcription sites. Genetic and molecular evidence has suggested that antigenic variation uses homologous recombination, but the detailed reaction pathways are not understood. In this study, we examine the recombination pathways used by trypanosomes to integrate transformed DNA into their genome, and show that they possess at least two pathways of homologous recombination. The primary mechanism is dependent upon RAD51, but a subsidiary pathway exists that is RAD51-independent. Both pathways contribute to antigenic variation. We show that the RAD51-independent pathway is capable of recombining DNA substrates with very short lengths of sequence homology and in some cases aberrant recombination reactions can be detected using such microhomologies.

The paper uses organisation theory to seek an explanation for the relative uniformity of governance structures (as distinct from other aspects of organisational structure) in public companies in the UK and USA. It then reviews theoretical and empirical evidence of ways in which these structures affect company performance, and finds that conventional views about the benefits of independent governance structures are not strongly supported.

This paper uses microdata from the 1992 Statistics Canada Family Expenditure Survey to provide evidence that male and female incomes do not always exert identical influences on household expenditures. The novelty of the paper lies in its demonstration that, while incomes may be pooled for some categories of consumption (e.g. housing), the income pooling hypothesis must be rejected for others. We also go beyond simply rejecting the pooling hypothesis to ask how male versus female income is used. Our results stress the on-going importance of traditional gender roles. For example, we find that expenditures on child care increase only with women’s incomes_higher male income is not associated with higher expenditure on child care even when both spouses are full-time, full-year paid workers.

This article explores how the introduction of new products by multiproduct firms might be affected by existing goods in each firm's portfolio. A logit analysis is conducted to estimate the effects of local monopoly power, cost advantages, and learning. Characteristics theory is used to determine whether the addition of a new product by a firm's existing portfolio creates the potential for local monopoly power. While the chemical similarity of products has the largest effect, results nonetheless indicate the empirical significance of potential monopoly power in influencing product introductions by multiproduct firms.