Friday, January 04, 2013

JSTOR: Journal of Political Economy, Vol. 86, No. 2 (Apr., 1978), pp. 229-243

http://www.jstor.org/discover/10.2307/1830062?uid=3738672&uid=2460338335&uid=2460338175&uid=2460337935&uid=2&uid=4&uid=83&uid=63&sid=21101616396837

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