Predictions of sharp increases in health-insurance premiums for people getting coverage under the U.S. Affordable Care Act have been overstated and many states will see little to no change, researchers at Rand Corp. found. Out-of-pocket premiums for most individuals who buy health plans through new insurance exchanges will decline because of federal subsidies, the Santa Monica, California-based nonprofit research group said today in a report. The researchers looked at insurance markets in 10 states to project costs as core parts of the 2010 health law kick in next year.