AMERICANS seem to like the idea of broadening health insurance coverage, but they may not want to be forced to buy it. With health care costs high and rising, such government mandates would make many people worse off. The proposals now before Congress would require just about everyone to buy health insurance or to get it through their employers — which would generally result in lower wages. In other words, millions of people would be compelled to spend lots of money on something they previously did not want, at least not at prevailing prices. Estimates of this burden vary, but...