“Sometimes there really are economies of scale. And the nation’s health insurance exchanges may be a case in point.

As rocky as the rollout of HealthCare.gov was, the federal exchange was relatively efficient in signing up enrollees. Each one cost an average of $647 in federal tax dollars, an analysis finds. It cost an average of $1,503 – well over twice as much – to sign up each person in the 15 exchanges run by individual states and Washington, D.C.”