Many goods and services can be readily provided through a series of unconnected transactions, but in health care, close coordination over time and within care episodes improves both health outcomes and efficiency. Close coordination is problematic in the U.S. healthcare system because the...

Randomized controlled trials are increasingly used to evaluate policies. How can we make these experiments as useful as possible for policy purposes? We argue greater use should be made of experiments that identify the behavioral mechanisms that are central to clearly specified policy questions,...