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Submitted on: 29 January 2015.
Revised on: 13 May 2015.
Accepted on: 07 July 2015.
___________________B E Journal of Theoretical Economics
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Submitted on: 10 April 2005.
Revised on: 27 May 2005.
Accepted on: 04 July 2005.
___________________B E Journal of Theoretical Economics
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Submitted on: 27 October 2014.
Revised on: 09 February 2015.
Accepted on: 27 March 2015.
___________________B E Journal of Theoretical Economics
Submitted on: 07 November 2011.
Revised on: 17 December 2011.
Accepted on: 05 February 2012.
___________________B E Journal of Theoretical Economics