In Massachusetts, ACA brings the smallest base rate increases "in memory" -- about 2% overall.

http://www.bostonglobe.com/business/2013/08/16/regulators-okay-new-health-insurance-base-rates-but-impact-premiums-will-vary-widely/102KAlKt1bLN1teN0YCbrO/story.html

State insurance regulators Friday issued new health insurance base rates for small employers and individuals renewing policies in the fourth quarter, and the first quarter of next year. But the rates shed little light on what employers and individuals will actually pay.

The base insurance rates will rise by an average of 2.1 percent for those customers who renew between Oct. 1 and the end of the year, and an average of 1.8 percent for those renewing after Jan. 1. Those are among the smallest increases in base rates in memory for the so-called small group market, which covers about 700,000 Massachusetts residents who are employees of small organizations or sole proprietors.

But the ultimate prices that individuals, businesses, and other customers in that market will pay will depend on a number of “rating factors,” ranging from workforce age to geographic area, that get tacked onto the base increase.

SNIP

Wakely’s study also predicted that the impact of the national law on Bay State individuals, families, and businesses will vary widely: Some base rates could be as much as 20 percent below the averages, while others could be 26 percent above the averages.