
Thanks to the Incidental Economist for calling attention to this chart.
In the traditional market, virtually all states require that renewal rate increases must be uniform for all policyholders in a block. But insurers can close a block, starving it of influx of newly underwritten policyholders, so rates will spiral. Healthy people in the block will tend to bail because they can still pass underwriting and so move to other, more favorably rated policies. Sick people stranded in the block will all face the same rate increase at renewal, but it will spiral even more rapidly as risk profile of the block deteriorates.For someone who is in the individual health insurance market, This. Is. Creepy. People with employer-provided insurance or Medicare have no idea how broken things are. Thankfully, on January 1st, 2014 Obamacare ends these games and allows the free market to function properly.