In recent weeks, the Trump administration has given new meaning to the notion of policy uncertainty. While every individual economic policy has proponents and detractors, and many would love to regularly erase rules they dislike and amplify those they love, most everyone realizes that policy certainty and predictability can also matter.

After receiving a relatively pleasing report from Robert Mueller, which eliminated a major piece of policy uncertainty, the administration threw things into flux by calling for court action to bring an end to Obamacare. With Washington abuzz, the administration said no, just kidding, and put that idea back in the policy cupboard for later development. Meanwhile, healthcare provider share values trembled.