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Submitted on: 27 April 2017.
Revised on: 04 July 2017.
Accepted on: 24 August 2017.
___________________Gospodarka Narodowa-The Polish Journal of Economics
Submitted on: 02 January 2003.
Revised on: 10 April 2003.
Accepted on: 03 June 2003.
___________________Gospodarka Narodowa-The Polish Journal of Economics
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Submitted on: 01 May 2005.
Revised on: 12 June 2005.
Accepted on: 27 July 2005.
___________________Gospodarka Narodowa-The Polish Journal of Economics
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Submitted on: 12 November 2015.
Revised on: 06 December 2015.
Accepted on: 02 January 2016.
___________________Gospodarka Narodowa-The Polish Journal of Economics
Submitted on: 24 November 2017.
Revised on: 23 February 2018.
Accepted on: 23 April 2018.
___________________Gospodarka Narodowa-The Polish Journal of Economics