Javier Milei won the Argentine presidency with a promise to rip up the state, dynamite the central bank and ditch the peso for the dollar. All are controversial, but none so controversial as his belief that there should be a legal market in human organs. 

The yuck factor led him to play down his views as the election neared, but trading in organs is one of the most interesting libertarian ideas—and regarded with horror by critics, who see it as the purest form of dystopian capitalism.