Saturday, January 05, 2013

JSTOR: The Review of Economic Studies, Vol. 41 (1974), pp. 123-137

http://www.jstor.org/discover/10.2307/2296377?uid=3738672&uid=2460338335&uid=2460338175&uid=2460337935&uid=2&uid=4&uid=83&uid=63&sid=21101617379407

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