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Submitted on: 24 March 2019.
Revised on: 04 May 2019.
Accepted on: 29 June 2019.
___________________JOURNAL OF AFRICAN ECONOMIES---OXFORD UNIV PRESS
Submitted on: 27 September 2015.
Revised on: 20 December 2015.
Accepted on: 02 February 2016.
___________________JOURNAL OF AFRICAN ECONOMIES---OXFORD UNIV PRESS
http://reply.papertrans.cn/2/152/15129/15129-34.png
Submitted on: 25 February 2011.
Revised on: 10 April 2011.
Accepted on: 22 April 2011.
___________________JOURNAL OF AFRICAN ECONOMIES---OXFORD UNIV PRESS
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