President-elect Donald Trumps vow to repeal the Affordable Care Act sent shares of hospital chains and insurers tumbling on the possibility that millions of customers could lose coverage.

Other big insurers -- UnitedHealth Group Inc., Aetna Inc. and Humana Inc. -- have already scaled back, after posting massive ACA losses.

As ACA premiums rise, said Aetna CEO Mark Bertolini, young people will choose beer over health insurance.

Monthly premiums for benchmark silver-level plans are going up by an average of 25 percent in the 38 states using the federal HealthCare.gov website.

UnitedHealth Group's stock rose this week, posting the best performance of the six biggest U.S. health insurers so far.

At least 1.4 million people in 32 states will lose the Obamacare plan they have now, according to state officials contacted by Bloomberg.

But the ex-president's critique was more nuanced than it seemed.

Researchers looked at both Clinton and Trump health reform proposals. Clintons campaign provided answers, while Trumps campaign referred the researchers to its website. Here are the results.