A new policy brief by John Graham at the Pacific Research Institute. Key points:

• Obamacare, signed in March 2010, has not reduced the rate of growth of health-insurance premiums, which increased by 20 percent in the small group market between 2008 and 2010.
• Obamacare subsidizes states to increase political control of health-insurance premiums, although there continues to be no evidence that such interference reduces the rate of growth of premiums.
• When monitoring competition, government regulators use a measurement of market concentration that does poorly when applied to choice in health insurance.
• New evidence continues to support the conclusion that Obamacare will lead to less choice of health insurance.

Read the whole thing: Over Regulation Reduces Choice in Health Insurance: An Update.