David Leonhardt of the New York Times has offered up a misleading defense of the Affordable Care Act (ACA) — i.e., Obamacare. Like several others, he celebrates the slowdown in health-care-cost escalation and suggests that the ACA is one reason for the deceleration. Specifically, he suggests that key ACA provisions — which he describes as nudging “the health care system away from paying for the quantity of medical care rather than the quality” — have already played a role in making the health system better and more efficient.

It would be an effective argument for the ACA if it were true. Unfortunately, it isn’t.