For example, some claim that health costs would fall dramatically if only insurance companies were allowed to sell policies across state lines. But California is already a huge market, with much more insurance competition than in other states; unfortunately, insurers compete mainly by trying to excel in the art of denying coverage to those who need it most. And competition hasn’t averted a death spiral. So why would creating a national market make things better?

More broadly, conservatives would have you believe that health insurance suffers from too much government interference. In fact, the real point of the push to allow interstate sales is that it would set off a race to the bottom, effectively eliminating state regulation. But California’s individual insurance market is already notable for its lack of regulation, certainly as compared with states like New York  yet the market is collapsing anyway.

Finally, there have been calls for minimalist health reform that would ban discrimination on the basis of pre-existing conditions and stop there. It’s a popular idea, but as every health economist knows, it’s also nonsense. For a ban on medical discrimination would lead to higher premiums for the healthy, and would, therefore, cause more and bigger death spirals.

So California’s woes show that conservative prescriptions for health reform just won’t work.

What would work? By all means, let’s ban discrimination on the basis of medical history  but we also have to keep healthy people in the risk pool, which means requiring that people purchase insurance. This, in turn, requires substantial aid to lower-income Americans so that they can afford coverage.

And if you put all of that together, you end up with something very much like the health reform bills that have already passed both the House and the Senate.

What about claims that these bills would force Americans into the clutches of greedy insurance companies? Well, the main answer is stronger regulation; but it would also be a very good idea, politically as well as substantively, for the Senate to use reconciliation to put the public option back into its bill.

But the main point is this: California’s death spiral is a reminder that our health care system is unraveling, and that inaction isn’t an option. Congress and the president need to make reform happen  now.