This working paper is also available at: http://ideas.repec.org/p/lbo/lbowps/2009_03.htmludEarlier versions of this paper appeared in the Journal of Financial Regulation andudCompliance (Vol.16, No.1, pp.19-34), March 2008, and as Working Paper No.udWP2008-9 in the Discussion Paper series of the Department of Economics ofudLoughborough University (September 2008).
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