Unclear about all of this?  Over at the Washington Post, Ezra Klein cuts through the static and offers up a comprehensive breakdown of this week’s Supreme Court review of the Affordable Care Act.

Health reform opponents contend that the decision not to do something — namely, not buy health insurance — is economic inactivity, rather than activity, and therefore not a behavior the federal government can regulate. Health reform supporters argue that the decision to not purchase health insurance has an economic effect. An individual without coverage, for example, may not have the money to pay for an emergency room visit, sticking hospitals or taxpayers with the bill.