Intellectual property scholars and policymakers often assert that technology and creative markets suffer from “anti-commons” (“AC”) effects that restrain innovation within a web of conflicting intellectual property claims. A minority view asserts that market players have incentives and...

Intellectual property rests on a simple incentive rationale: without imitation barriers, innovators rationally decline to invest. But this blanket proposition is incompatible with markets where innovation proceeds without substantial recourse to intellectual property and imitation is widespread....