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Submitted on: 31 March 2018.
Revised on: 17 May 2018.
Accepted on: 04 June 2018.
___________________JOURNAL OF ECONOMIC GROWTH---SPRINGER
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Submitted on: 09 November 2010.
Revised on: 01 March 2011.
Accepted on: 18 April 2011.
___________________JOURNAL OF ECONOMIC GROWTH---SPRINGER
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