Article history: Received 5 February 2007 Available online 28 November 2008 JEL classification: C72

Article history: Received 7 March 2006 Available online 19 March 2009 JEL classification: D82 J33 M50

Article history: Received 26 October 2012 Available online 23 October 2015 JEL classification: J41 J24 D21

Article history: Received 10 November 2010 Available online 14 April 2011 JEL classification: C78

Article history: Received 1 May 2016 Available online xxxx JEL classification: C92 D70

Article history: Received 22 February 2012 Available online 30 May 2013 JEL classification: D83 C91 C14

Article history: Received 11 June 2009 Available online 16 September 2010 JEL classification: C02 C73

Article history: Accepted 17 January 2014 Available online 15 February 2014 JEL classification: C62 E21 E22

Article history: Received 24 February 2012 Available online 14 October 2013 JEL classification: C72

Article history: Received 6 September 2013 Available online 8 December 2014 JEL classification: D74 D90