Submitted on: 08 March 2022.
Revised on: 25 June 2022.
Accepted on: 14 August 2022.
___________________JOURNAL OF MATHEMATICAL ECONOMICS
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Submitted on: 18 May 2002.
Revised on: 11 August 2002.
Accepted on: 27 August 2002.
___________________JOURNAL OF MATHEMATICAL ECONOMICS
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