At his press conference Tuesday, President Obama assured Americans that, “To the 85-90 percent of Americans who already have health insurance: They’re already experiencing most of the benefits of the Affordable Care Act even if they don’t know it.”

Those benefits apparently include higher premiums. According to the Wall Street Journal, insurers are warning that premiums in the individual and small-group markets could double in the next few years. Already, they are well on their way. For example, California health insurers are proposing increases for some customers of 20 percent or more: 26 percent by Blue Cross, 22 percent by Aetna, and 20 percent by Blue Shield. In Maryland, Care First, the state’s largest insurer, has proposed a 25 percent increase for next year.

Younger and healthier Americans can expect to pay even more. According to a survey by the American Action Forum, healthy young people in the individual or small-group insurance markets can look forward to rate increases averaging as much as 169 percent.

While it is always difficult to pin down the exact reason for premium increases, a large portion is traceable to the new health care law. According to a recent study by the American Society of Actuaries, Obamacare will increase health insurance claims costs by 32 percent because of increased adverse selection in the insurance pool. That is, the law’s prohibition on medical underwriting will bring more older and sicker people into the insurance pool, while higher premiums will encourage the young and healthy to forgo insurance until they get sick. (The penalty under Obamacare’s individual mandate is low enough so that it will generally be cheaper for healthy people to “pay,” rather than “play.”)

In addition, Obamacare requires all health insurance plans to provide more benefits and have lower deductibles and co-payments than they do today…

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