http://reply.papertrans.cn/3/266/26554/26554-21.png
http://reply.papertrans.cn/3/266/26554/26554-22.png
http://reply.papertrans.cn/3/266/26554/26554-23.png
Submitted on: 03 April 2018.
Revised on: 20 April 2018.
Accepted on: 28 April 2018.
REVIEW OF ECONOMICS AND STATISTICS
http://reply.papertrans.cn/3/266/26554/26554-25.png
Submitted on: 17 October 2009.
Revised on: 03 November 2009.
Accepted on: 14 November 2009.
REVIEW OF ECONOMICS AND STATISTICS
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Submitted on: 28 December 1999.
Revised on: 16 January 2000.
Accepted on: 23 January 2000.
REVIEW OF ECONOMICS AND STATISTICS