Exchanges set up by the Affordable Care Act were designed to give customers a chance to shop for coverage and then buy a plan, most with help from tax credits. The idea was that such a marketplace would push insurers to offer affordable plans to compete for customers.
But insurers in many markets have been pulling back from the exchanges after losing money. According to an analysis by the Associated Press and the health care firm Avalere Health, more than 1,000 counties, where about 2.8 million people are insured through the exchanges, are down to their last insurance carrier, according to the most recent data.
