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On the Growth and Welfare Effects of Defense R&D

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  • ANGUS C. CHU
  • CHING-CHONG LAI

Abstract

In the US, defense R&D share of GDP has decreased significantly since 1960. To analyze the implications on growth and welfare, we develop an R&D-based growth model that features the crowding-out and spillover effects of defense R&D on civilian R&D. The model also captures the effects of defense technology on (i) national security resembling consumption-type public goods and (ii) aggregate productivity via the spin-off effect resembling productive public goods. In this framework, economic growth is driven by market-based civilian R&D as in standard R&D-based growth models and government-financed public goods (i.e., defense R&D) as in Barro (1990). We find that defense R&D has an inverted-U effect on growth, and the growth-maximizing level of defense R&D is increasing in the spillover and spin-off effects. As for the welfare-maximizing level of defense R&D, it is increasing in the security-enhancing effect of defense technology, and there exists a critical degree of this security-enhancing effect below (above) which the welfare-maximizing level is below (above) the growth-maximizing level.

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File URL: http://hdl.handle.net/10.1111/j.1467-9779.2012.01550.x
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Bibliographic Info

Article provided by Association for Public Economic Theory in its journal Journal of Public Economic Theory.

Volume (Year): 14 (2012)
Issue (Month): 3 (06)
Pages: 473-492

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Handle: RePEc:bla:jpbect:v:14:y:2012:i:3:p:473-492

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