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Submitted on: 10 February 2018.
Revised on: 10 March 2018.
Accepted on: 12 April 2018.
___________________ECONOMETRICA---WILEY
Submitted on: 05 September 1999.
Revised on: 08 October 1999.
Accepted on: 26 October 1999.
___________________ECONOMETRICA---WILEY
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