The White House should consider building on the HRA rule by requiring that all newly incorporated businesses seeking the tax break for employer coverage do so through HRAs. Such a reform would preserve traditional employer-based group health insurance for those who have it, while ensuring that start-ups that evolve into the Googles and Apples of the future deploy the new model.

Of all the things we might do to improve our health care system, the one reform that is more important than any other is almost never discussed.

It is ignored by Republicans. By Democrats. By the experts. By the think tanks. And by just about everybody who has an opinion on health policy.

Here it is: If we want the system to work well, we must make it profitable to take care of sick people.

Last Thursday afternoon, the Trump administration released its final rule regarding Health Reimbursement Arrangements (HRAs). The 497-page document will take lawyers and employment professionals weeks to absorb and digest fully. But in a nutshell, the rule will help to make coverage more portable and affordable—while also going a long way to resolve the problem of pre-existing conditions.

Medicare for All has become a litmus test in the Democratic Party, but some leaders — including House Speaker Nancy Pelosi and former vice president and current presidential candidate Joe Biden — are wary of the political consequences of stripping private insurance from the 180 million people enrolled in job-based coverage. They are pushing a “public option” as a less threatening alternative.

A public option is sold as less disruptive than Medicare for All but it would have similar results, and a similar destination. If enacted, private insurance would wither, competition would decline, innovation would slow, and the costs of health coverage would be hidden inside ever-rising tax bills.