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Submitted on: 10 December 2021.
Revised on: 13 February 2022.
Accepted on: 25 March 2022.
___________________German Economic Review---WALTER DE GRUYTER GMBH
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Submitted on: 28 November 2001.
Revised on: 26 February 2002.
Accepted on: 24 April 2002.
___________________German Economic Review---WALTER DE GRUYTER GMBH
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Submitted on: 28 January 2006.
Revised on: 28 February 2006.
Accepted on: 23 March 2006.
___________________German Economic Review---WALTER DE GRUYTER GMBH
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