(By Bradley C Bower/Associated Press)

This has a lot of wonkish allure, particularly if you think, as I do and Matt does and Tyler does, that medical care is overvalued. But it misses the problem that leads to universal health-insurance systems: As a society, we are not willing to let people die painfully in the street, even if they have previously made decisions that would lead to that outcome. In reality, what terrifies all of us is what happens after someone takes the cash and then gets sick.

Let’s run through the cash-grant world: At age 65, grandma decides to purchase no health-care plan, as she figures she’ll just get one when she gets sick, or maybe just get one next year, or perhaps she just doesn’t want to spend money extending decrepitude. But then she has a stroke and gets rushed to the hospital. Someone is paying for that emergency care. It might be the hospital. It might be the taxpayers. But it’s someone: The paramedics aren’t going to refuse to lift her onto the gurney. And then she needs rehabilitation. Someone is going to end up paying for that, too. Or perhaps she gets leukemia and, in a display of consistency, doesn’t want heroic efforts made to fight it. But are we really prepared to deny her pain meds? Or hospice?

Perhaps you just build in a requirement that grandma has to at least purchase a catastrophic care plan. The problem with catastrophic care plans, of course, is that they often don’t cover the care you need. That’s why they’re cheaper. So the question is what happens when grandma needs more than the catastrophic care plan will provide — and when you’re dealing with seniors, that’s a “when,” not an “if.” The secondary question is whether grandma stops paying for the preventive care that she can put off, and that leads to higher emergency costs down the road. We’ve certainly seen that before, too.

This is why Medicare is universal and the health-care law has an individual mandate. If we were willing to let people simply live with the consequences of their decisions, we could have a very different health-care system than we do. But we’re not — and, as a compassionate, rich society, I don’t think that’s such a bad thing. This is why we, like every other developed nation, are moving toward insurance solutions that assume an eventual need for health care. If we can’t say no credibly, then we need to say yes responsibly, and in advance.