What are the legitimate functions of government?

Gandalf.

I agree that taxpayers shouldn't pay for baseball stadiums and the like. So we see eye to eye on that. But what if the consumers are powerless to stop a corporation? Suppose Microsoft managed to get its operating system on to everything - they would, then, control everything. What then? Consumers stop buying their products? What if Microsoft started stealing money from consumers' bank accounts? What if the big dissenters were completely drained and their identity erased? No coersion, though, so it's all good?