Err, the government does.
Perhaps you ought to go to Wikipedia and look up the difference between Libertarianism and Anarchy?
Perhaps you ought to go to Wikipedia and look up the difference between Libertarianism and Anarchy?
How does a Libertarian system decide which roles (like researching the intentions of foreign states, and defending against them) a government should play, and which (like presumably researching the weather, and defending against natural disasters) it shouldn't?