http://reply.papertrans.cn/3/239/23886/23886-21.png
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http://reply.papertrans.cn/3/239/23886/23886-23.png
http://reply.papertrans.cn/3/239/23886/23886-24.png
Submitted on: 18 June 2022.
Revised on: 31 July 2022.
Accepted on: 23 August 2022.
OXFORD BULLETIN OF ECONOMICS AND STATISTICS
http://reply.papertrans.cn/3/239/23886/23886-26.png
Submitted on: 24 December 2017.
Revised on: 08 January 2018.
Accepted on: 29 January 2018.
OXFORD BULLETIN OF ECONOMICS AND STATISTICS
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