Last week I testified before the House Oversight committee on the “risk corridors” in the (ObamaCare) exchanges. Republicans claim that this is a device to bail out the insurance companies. Democrats, in the unusual position of defending the insurance companies, actually claimed that the government was going to make a “profit” because of it. I was in the uncomfortable position of not agreeing completely with either side. The Affordable Care Act creates a new health insurance marketplace (the exchange). But because of the great uncertainty about what buyers will enter the market and who will buy what product, the law...