With the fourth open-enrollment period set to begin this fall for the marketplaces set up by the Affordable Care Act, it’s becoming clear that the market for health insurance has not evolved as expected, or hoped.

The market is smaller than projected. The people who have bought health plans overall are sicker than predicted. And health insurers have incurred larger losses than anticipated.

As a result, some large national insurance companies, including UnitedHealthcare, Humana and Aetna, plan to abandon markets across the country next year. And health insurers in Wisconsin are proposing the largest rate increases yet for health plans sold on the online marketplaces throughout the state.

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Increasingly, U.S. consumers may have fewer insurance options under Obamacare.

The latest evidence comes in a study from consulting firm Avalere Health, which examined areas, known as rating regions, that insurers use to set premiums and decide where to offer plans to individuals under the Affordable Care Act.

According to Avalere, 36 percent of the approximately 500 rating regions in the U.S. may have just one health insurer when the 2017 signup season starts on Nov. 1. Another 19 percent could have just two carriers. There was far more competition this year, with about two-thirds of rating areas having three or more health insurers vying for customers’ business, according to Avalere.

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People joked for a while about how insurers were pulling out of Obamacare markets so fast we might end up with areas in which there were no insurers at all.  It’s no joke anymore: with Aetna’s massive withdrawal yesterday from the Affordable Care Act marketplace, Pinal County, Arizona, the third most populated county in that state, currently has no insurers selling policies on the Exchange.  The issue isn’t so much whether people will be subject to the individual mandate tax of up to 2.5% of their income when there are no policies available; an administration that has no difficulty calling a utility shutoff notice a hardship that excuses one from the individual mandate (whether or not the utility was actually shut off) should have no difficulty declaring the non-existence of any insurance to be grounds for an exemption.  The issue is that Pinal County, although a bit of an outlier for now, is a harbinger for fundamental problems with the ACA now manifesting themselves with greater clarity across the country. When an insurer covering over 7% of those in the Exchanges and previously hoping to expand instead drops out, we better look at what is going on.

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Barack Obama’s signature health-care law is struggling for one overriding reason: Selling mispriced insurance is a precarious business model.

Aetna Inc. dealt the Affordable Care Act a severe setback by announcing Monday it would drastically reduce its participation in its insurance exchanges. Its reason: The company was attracting much sicker patients than expected. Indeed, all five of the largest national insurers say they are losing money on their ACA policies and three, including Aetna, are pulling back from the exchanges as a result.

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So much for choice. In many parts of the country, Obamacare customers will be down to one insurer when they go to sign up for coverage next year on the public exchanges.

A central tenet of the federal health law was to offer a range of affordable health plans through competition among private insurers. But a wave of insurer failures and the recent decision by several of the largest companies, including Aetna, to exit markets are leaving large portions of the country with functional monopolies for next year.

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Tennessee’s insurance regulator approved hefty rate increases for the three carriers on the Obamacare exchange in an attempt to stabilize the already-limited number of insurers in the state.

The rate approvals, while a tough decision, were necessary to ensure that consumers around the state had options when open enrollment begins in November, said Julie Mix McPeak, commissioner of the Tennessee Department of Commerce and Insurance. BlueCross BlueShield of Tennessee is the only insurer to sell statewide and there was the possibility that Cigna and Humana would reduce their footprints or leave the market altogether.

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All but the most hardened partisans understand that the Affordable Care Act’s insurance exchanges are in serious trouble. In 2010, the Congressional Budget Office predicted that 21 million people would have exchange-based coverage in 2016; the real number was about 12 million. As insurers head for the exits, the gap between initial hype and final reality will widen.

The tragedy is that this was entirely avoidable. The ACA’s exchanges were fundamentally flawed in their design, something that private-sector experts tried to point out at the time. In October 2009, PricewaterhouseCoopers published a report projecting that by 2016, the ACA would cumulatively increase individual-market health insurance premiums by 47 percent.

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