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Submitted on: 02 October 2001.
Revised on: 29 December 2001.
Accepted on: 13 January 2002.
___________________ECONOMIC THEORY---SPRINGER
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http://reply.papertrans.cn/1/80/7957/7957-34.png
Submitted on: 06 March 2015.
Revised on: 24 June 2015.
Accepted on: 10 August 2015.
___________________ECONOMIC THEORY---SPRINGER
Submitted on: 08 December 2015.
Revised on: 12 February 2016.
Accepted on: 02 March 2016.
___________________ECONOMIC THEORY---SPRINGER