Buchanan's liberal theory of political economy : a valiant but failed effort to square the circle / Richard E. Wagner -- Buchanan on ethics and self-interest in politics : a contradiction or reconciliation? / Roger D. Congleton -- Constitutional hopes and post-constitutional fears : the role of...

The Government of Colombia imposes a variety of taxes that must be paid by individual wage earners, called in their entirety "social protection contributions". Since 2007 individual payments have been collected using an on-line mechanism. In order to improve compliance, the Government used a...