Article history: Received 17 November 2012 Accepted 11 February 2013 Available online 18 February 2013

Article history: Received 18 September 2008 Received in revised form 11 February 2011 Accepted 21 February 2011 Available online 24 February 2011 JEL classification: C91 C92 PsycINFO classification: 3020 3900

Article history: Article history: Received 18 December 2016 Accepted 16 February 2017 Available online 25 February 2017

Article history: Received 18 November 2008 Received in revised form 9 February 2009 Accepted 10 February 2009 Available online xxxx

Article history: Received 8 September 2014 Received in revised form 8 January 2015 Accepted 18 February 2015 Available online 25 February 2015

Article history: Received 18 March 2009 Received in revised form 8 February 2010 Accepted 22 February 2010 Available online 7 March 2010

Article history: We explore the sensitivity o Received 1 September 2007 Received in revised form 25 February 2008 Accepted 27 February 2008 Available online 18 March 2008