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Submitted on: 04 May 2000.
Revised on: 19 July 2000.
Accepted on: 13 September 2000.
___________________Istanbul Iktisat Dergisi-Istanbul Journal of Economics
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Submitted on: 08 February 2014.
Revised on: 17 March 2014.
Accepted on: 13 April 2014.
___________________Istanbul Iktisat Dergisi-Istanbul Journal of Economics
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