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Submitted on: 28 January 2015.
Revised on: 06 March 2015.
Accepted on: 17 March 2015.
___________________EUROPEAN ECONOMIC REVIEW---ELSEVIER
Submitted on: 17 February 2017.
Revised on: 09 April 2017.
Accepted on: 23 April 2017.
___________________EUROPEAN ECONOMIC REVIEW---ELSEVIER
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