The dominant theme of some of the great classic works in the classical-liberal tradition – books such as Ludwig von Mises’s 1927 Liberalism and Henry Hazlitt’s 1964 The Foundations of Morality – is that a society based on private property and free markets promotes an extensive, productive, and marvelous web of social cooperation.
I discovered only just this morning this superb 2012 Learn Liberty video, on social cooperation, featuring the philosopher Aeon Skoble. Do watch!