You could either outsource n get it from outside the firm, use the market, or you could produce them in house. And they do mix of both, yes. We see general motes doing another morkment doing some of it, but not othat it. Yaaheton to another party and his own. It's sound at thy were telling th truo, that's really contracting out.
Don Boudreaux of George Mason University and Cafe Hayek talks with EconTalk host Russ Roberts about the intellectual legacy of Ronald Coase. The conversation centers on Coase's four most important academic articles. Most of the discussion is on two of those articles, "The Nature of the Firm," which continues to influence how economists think of firms and transaction costs, and "The Problem of Social Cost," Coase's pathbreaking work on externalities.