<P>卷,期,页码:Vol. 93, No. 2, Papers and Proceedings of the One Hundred Fifteenth Annual Meeting of the American Economic Association, Washington, DC, January 3-5, 2003 (May, 2003), pp. 175-179<br>电子链接:<a href="http://links.jstor.org/sici?sici=0002-8282(200305)93%3A2%3C175%3ALP%3E2.0.CO%3B2-C" target="_blank" >http://links.jstor.org/sici?sici=0002-8282(200305)93%3A2%3C175%3ALP%3E2.0.CO%3B2-C</A></P>
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