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Abstract  

Scientific productivity is constant as a scientist ages according to recent studies relying mainly on quantity measures of productivity. An economic model of the life-cycle productivity of scientists is presented which implies that the number of citations made to a scientist's previous work will decline with age. The implication could be consistent with the finding of constant quantity output with age if the decline in quality (as measured by number of citations per article) is large enough.

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International Linkage of National Economic Models . North Holland Publishing Company , Holland ( 1975 ). 8 B auwens , L. , Bayesian Full Information Analysis of

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demonstrate the potential advantages of locally-owned private firms over the multinationals while Shenzhen Special Economic Zone and Investment Zones for Taiwanese Investors are designated to adopt FDI-leveraging economic model for industrialization. The

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Canadian Journal of Agricultural Economics 0.000224 0.000121 0.000114 0.000144 D Economic Modelling

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-008-2070-3 . Boland , LA 1989 The methodology of economic model building Routledge London . Borsboom , D , Mellenbergh , GJ J van Heerden 2003 The theoretical

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. Particularly in high-tech industries, there are powerful knowledge flows running from the scientific institutions to the industrial sectors. Nightingale's ( 1998 ) cognitive theory of innovation paralleled the formal economic model of Evenson and Kislev ( 1975

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to publishers (e.g., ACM, Springer, Wiley). Most publishers then grant their subscribers access to papers provided that they pay a membership fee or pay-per-use fee (Zamparelli 1998 ). This economic model is a hindrance to content-based SLRSs. First

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