In market theory the "selfishness" of the economic agent - in this case the GP practice - drives the efficiency of the system by forcing other economic agents to compete to provide the most efficient service.

BBC: Health Bill: Where's the strategic argument?

And our legal theory was that the Sundial was a public forum for student expression, and that Rawitch, as an agent of the state, was prohibited by the Constitution from either censoring its content or exacting punishment after the fact.

WSJ: Best of the Web Today: See You in the Funny Papers