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.
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 economicmodel for industrialization. The
. 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 economicmodel of Evenson and Kislev ( 1975
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 economicmodel is a hindrance to content-based SLRSs. First