Germany is a lot smaller than the U.S., but it has a lot more health insurers to choose from, and cheaper health-care costs. One reason might be more competition: in the U.S., you can’t buy individual health insurance from an out-of-state insurer, since an obsolete federal law lets states block purchases across state lines, taking away interstate-shopping rights that citizens would otherwise enjoy under the the Constitution’s Interstate Commerce Clause. That leaves patients with fewer choices, higher prices, and less competition…

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