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Submitted on: 22 January 2000.
Revised on: 20 April 2000.
Accepted on: 28 May 2000.
___________________JOURNAL OF MATHEMATICAL ECONOMICS
Submitted on: 27 September 2018.
Revised on: 16 January 2019.
Accepted on: 15 February 2019.
___________________JOURNAL OF MATHEMATICAL ECONOMICS
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Submitted on: 27 April 2007.
Revised on: 27 May 2007.
Accepted on: 07 June 2007.
___________________JOURNAL OF MATHEMATICAL ECONOMICS
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Submitted on: 18 September 2014.
Revised on: 09 January 2015.
Accepted on: 05 February 2015.
___________________JOURNAL OF MATHEMATICAL ECONOMICS