And so, there are only two paths for man to acquire property and wealth: production or coercive expropriation. Or, as the great German sociologist Franz Oppenheimer perceptively put it, there are only two means to the acquisition of wealth. One is the method of production, generally followed by voluntary exchange of such products: this is what Oppenheimer called the economic means. The other method is the unilateral seizure of the products of another: the expropriation of another man's property by violence. This predatory method of getting wealth Oppenheimer aptly termed the political means.
Murray N. Rothbard
The Ethics of Liberty, p. 49
Murray N. Rothbard
The Ethics of Liberty, p. 49