Demand for Genetic Resources and the U.S. National Plant Germplasm System

Although genetic resources have strong public-goods characteristics, public genebanks often have struggled for adequate funding. A review of economic literature on the value of plant genetic resources indicated that more information is needed about germplasm use. The data compiled in this paper examine patterns of germplasm use for one of the world\u27s largest national genebank networks, the U.S. National Plant Germplasm System (NPGS). Data on 10 major crops, gathered directly from within the NPGS and from end-users, revealed patterns of usage for germplasm during the period from 1995 to 1999. Data were collected describing the characteristics of NPGS users, the types of germplasm requested, the purpose of requests, and, when applicable, the specific traits sought. From these findings, we estimated the utility of distributed materials, their secondary use, and projected future demand for NPGS resources. To explore relationships between the usefulness of germplasm samples and accompanying data in a more systematic fashion, we estimated a linear regression. The regression model suggests that accompanying data make germplasm more useful. We conclude that demand for NPGS resources was substantial and came from broad range of users. Utilization rates were higher than suggested by past studies. Countries with developing economies made greater use of NPGS resources, relatively speaking, than did countries with high-income economies. Finally, demand for NPGS resources is likely to increase, especially among users in countries with developing economies

Do Foreign Occupations Cause Suicide Attacks?

The phenomenon of suicide attacks has dramatically expanded over the last twenty years, rising from no events in 1980 to a total of 1,398 events by 2008. A prominent theory has argued that suicide attacks are a coercive strategy aimed at ending foreign military occupation by democracies. Yet these conclusions are based on a research design that is affected by selection bias and that fails to distinguish foreign occupations from cases of groups seeking independence or autonomy, which we term domestic occupations. Analyzing an original data set that distinguishes the different types of occupation, we find that only foreign occupations have a strong and consistent effect on the incidence of suicide attacks. The reason, we argue, is that suicide attacks only become cost effective when targets are both hardened and accessible, a strategic environment that is more common to civil wars and foreign occupations than to domestic occupations