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Submitted on: 25 April 1998.
Revised on: 07 May 1998.
Accepted on: 21 May 1998.
QUARTERLY JOURNAL OF ECONOMICS
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Submitted on: 29 October 2001.
Revised on: 11 November 2001.
Accepted on: 18 November 2001.
QUARTERLY JOURNAL OF ECONOMICS
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http://reply.papertrans.cn/3/260/25945/25945-28.png
Submitted on: 03 December 2020.
Revised on: 04 January 2021.
Accepted on: 21 January 2021.
QUARTERLY JOURNAL OF ECONOMICS
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