There’s a joke among insurers that there are two things that health insurance companies hate to do — take risks and pay claims. But, of course, these are the essence of their business! Yet, if they do too much of either, they will go broke, and if they do too little, their customers will find a better policy. This balancing act isn’t too hard if they have a pool sufficient to average out the highs and lows. I speak with some experience as the former CEO of one of these...