Will insurer mergers raise healthcare costs?

The five major health insurers will soon become three. Cigna and Anthem are merging. That follows Humana and Aetna. UnitedHealth just completed a big deal too. There are concerns these companies will now have more clout to boost premiums.

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CNNMoney assistant managing editor Paul LaMonica highlights the latest news from Wall Street and what's moving the markets in his daily investing commentary.
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