A Great Sociological Achievement of Classical Political Economy Was to Recognize the Social Function of Private Property

The division of individuals into owners and non-owners is an outcome of the division of labour.

The second great sociological achievement of Classical Political Economy and the  “individualistic” social theory of the eighteenth century was to recognize the social function of private property. From the older point of view property was always considered more or less a privilege of the Few, a raid upon the common stock, an institution regarded ethically as an evil, if sometimes as an inevitable one. Liberalism was the first to recognize that the social function of private ownership in the means of production is to put the goods into the hands of those who know best how to use them, into the hands, that is, of the most expert managers. Nothing therefore is more foreign to the essence of property than special privileges for special property and protection for special producers. Any kind of constraint such as exclusive rights and other privileges of producers, are apt to obstruct the working of the social function of property. Liberalism fights such institutions as vigorously as it opposes every attempt to limit the freedom of the worker. 

—Ludwig von Mises, Socialism: An Economic and Sociological Analysis, trans. J. Kahane (Indianapolis: Liberty Fund, 1981), 276-277.