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The Boston Globe

Business

Small businesses fear rise in health costs under new US rules

Small businesses, which bore the brunt of health insurance increases over the past decade, were heartened when a state law passed in 2010 allowed­ them to band together to buy coverage at a discount through newly established health insurance cooperatives.

But trade groups that set up such group-purchasing co-ops now say they are threatened by new federal rules stemming from the national health care overhaul that would override Massachusetts insurance rating factors, boosting the premiums small employers pay.

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