(Bloomberg Businessweek) — The possibility that the U.S. Supreme Court will soon eliminate federal subsidies for people buying health insurance through the Affordable Care Act is the biggest story in politics and economics that no one wants to talk about. But the stakes in King v. Burwell, which the court will hear on March 4, could scarcely be higher: If the plaintiffs prevail, millions of people in 34 states who bought insurance on federal exchanges would suddenly lose the subsidies that make it affordable.

Consequently, most would lose their coverage. A Rand study pegged the number at 9.6 million people, with premiums soaring 47 percent for those still able to afford them. "Everyone agrees this would be a cataclysmic hit to the insurance market," Michael Kolber, a health care attorney at Manatt, Phelps & Phillips, said at a Feb. 13 Bloomberg Intelligence panel on King v. Burwell.

The immediate effect of a ruling against the ACA would be to hurl the political system, and no small part of the economy, into chaos. Yet there's little sign that Washington is preparing for that scenario. Democrats won't talk about what they would do because they don't want the court to believe they could contain the fallout.