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Submitted on: 05 October 2014.
Revised on: 01 December 2014.
Accepted on: 20 December 2014.
___________________Economic Theory Bulletin---SPRINGER HEIDELBERG
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Submitted on: 30 September 2012.
Revised on: 24 October 2012.
Accepted on: 16 December 2012.
___________________Economic Theory Bulletin---SPRINGER HEIDELBERG
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Submitted on: 25 December 2002.
Revised on: 15 February 2003.
Accepted on: 04 April 2003.
___________________Economic Theory Bulletin---SPRINGER HEIDELBERG
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Submitted on: 03 November 2001.
Revised on: 06 February 2002.
Accepted on: 24 February 2002.
___________________Economic Theory Bulletin---SPRINGER HEIDELBERG
Submitted on: 02 September 2006.
Revised on: 05 December 2006.
Accepted on: 17 January 2007.
___________________Economic Theory Bulletin---SPRINGER HEIDELBERG
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