(IMHO, the Randian/Propertarian argument of the supremacy of the Free Market is somewhat naïve, for the reasons Charlie describes (markets are good for some things but not all); the recent fashion of defining everything as being, in its basic sense, a market is rather daft. OTOH, I don't think the future belongs to any variant of Marxism (which was, after all, constrained by its 19th-century backgrounds).)
And then there's the "Cowboys vs. Eurotrash" subtext that usually emerges in the whole recurring argument, with predominantly American Libertarians making smug digs at the bankrupcy and impending collapse of Eurosocialism (usually coming down to how the ultimate oracle of the Market has shown that Big Macs and Britney Spears are inherently superior to baguettes and Johnny Hallyday, and any argument to the contrary is just the elitism of sore losers in the global cultural marketplace), and left-leaning Europeans pointing at rampant obesity, firearm deaths and other aspects of the Ugly American stereotype in response.
In that context, I'm really glad I'm from a completely different continent.