The problem of climate change seems to be a tragedy of the commons: despite the global benefits of reducing green-house gas emissions, no individual has any incentive to reduce his or her own emissions. Yet many people are making efforts to reduce emissions and putting pressure on businesses and...

A simple prototype diffeomorphism containing a chaotically forced bistability is demonstrated to produce Weierstrass-function-like basin boundaries of self-affine, self-similar, and/or nowhere differentiable fractal structure, depending on two competing characteristic exponents.

Authors' further comments and examples following their paper (Derman, C., M. Klein. 1958. Inventory depletion management. Management Sci. 4 (4, July).).

A model is developed to aid in determining examination schedules for the detection of an age-dependent disease. It is shown that in an optimal schedule the interval between examinations is proportional to the square root of the age-specific incidence probability of the disease. To illustrate the...

The Role of Trade in Ending Poverty looks at the complex relationships between economic growth, poverty reduction and trade, and examines the challenges that poor people face in benefiting from trade opportunities. Written jointly by the World Bank Group and the WTO, the publication examines how...

Global trade has contributed strongly to reducing poverty but important challenges remain in making trade work for the poorest. This publication presents eight case studies to reveal how trade can help to reduce poverty in developing countries. It focuses on four constraints faced by the...