Friday, January 04, 2013

JSTOR: Econometrica, Vol. 48, No. 3 (Apr., 1980), pp. 663-673

http://www.jstor.org/discover/10.2307/1913129?uid=3738672&uid=2460338335&uid=2460338175&uid=2460337935&uid=2&uid=4&uid=83&uid=63&sid=21101616396837

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