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Submitted on: 24 January 2000.
Revised on: 20 March 2000.
Accepted on: 18 April 2000.
___________________APPLIED ECONOMICS LETTERS---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
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Submitted on: 26 August 2023.
Revised on: 13 October 2023.
Accepted on: 24 November 2023.
___________________APPLIED ECONOMICS LETTERS---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
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