ssion places the highest value. As economists age, those who were the most productive early in their careers are among the few "survivors" still contributing to scholarship through the leading scholarly outlets.
Whether this relationship is due to natural declines in capacity or decreased incentives to produce is extremely difficult to discern. Unlike athletes, where it is likely that pure physical deterioration causes the reduction in productivity with age, among scholars even the fairly subtle facts that we have uncovered can be marshaled as support for each of these competing hypotheses. Without direct observation on how scholars' use of time changes as they age, we are unlikely to be able to distinguish between explanations of the declining ageproductivity relationship in science.
REFERENCES
Berger, Mark, and Frank Scott, "Changes in U.S. and Southern Economics Deparment Rankings over Time," Growth and Change 21 (Summer 1990), 21-31.
Blank, Rebecca, "The Effects of Double-Blind versus Single-Blind Reviewing," American Economic Review 81 (Dec. 1991), 10411067.
Diamond, Arthur, "The Life-Cycle Research Productivity of Mathemati cians and Scientists," Journal of Gerontology 41 (1986), 520-525.
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论文题目：
AGING AND PRODUCTIVITY AMONG ECONOMISTS 
