Q: Alright, and who pays for the police force?

A: Under pure capitalism all human relationships are voluntary – not even the government can take one penny by force from anyone. So how do you finance a government without taxation? The answer is you don’t, at least not in my lifetime, or yours unless you’re a teenager. But what we can do is work toward far lower taxes, perhaps only one tax, a sales tax. There is no such thing as a fair tax, but a consumption tax seems to be the least destructive. Obviously to reduce taxes even to a single consumption tax the government would have to totally abandon the nanny state.

For more on financing a government voluntarily, click on the link.
http://www.rationalselfinterest.com/post/financing-government