Bernie Sanders' New Favorite Medicare for All Study Has Major Problems

Has any question taken up more airtime at the Democratic debates than how to pay for Medicare for All? The question keeps being asked partly because multiple estimates have found that the single-payer plan, which would eliminate virtually all private health insurance, would require more than $30 trillion in additional government spending over a decade, a historically unprecedented sum. But it has also been a fixture because of the way it has caused candidates to stumble in revealing ways.

No primary candidate is more closely associated with Medicare for...