Why is libertarianism so infallible?

It is due to it being the application of political science. It does not permit failed policies to be continued fruitlessly year after year with idealistic fervour, it is next to impossible for anyone surrounded by fierce libertarian critics to continue clinging on to lies. It is a purely functional machine, lubricated with justice and fueled by free speech.

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Not the same as buying and selling employees. Businesses are more skilled at deciding what they want rather than which specific individual out of millions they want, so they would buy a "job". Unions are the ones providing a service and of course they want as many members as possible to increase their clout and profts. It just makes sense.