Last week, Aetna, the third-largest private health insurer in the U.S., held its annual investor conference in New York, in which company executives laid out their detailed assessment of the post-election environment for health insurance. Aetna's comments, and those of its peers in similar settings, illustrate how Obamacare will dramatically drive up the cost of health insurance in the United States. "In some markets," said Aetna CEO Mark Bertolini, increases in premiums could "go as high as 100 percent. And we've done all that math. We've shared it with all the regulators. We've shared it with all the people in Washington that need to see it. And I think it?s a big concern."