Friday, January 04, 2013

JSTOR: The Review of Economic Studies, Vol. 45, No. 2 (Jun., 1978), pp. 347-354

http://www.jstor.org/discover/10.2307/2297349?uid=3738672&uid=2460338335&uid=2460338175&uid=2460337935&uid=2&uid=4&uid=83&uid=63&sid=21101616328587

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