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It's do-or-die week for ACA stabilization

Sens. Susan Collins and Lamar Alexander
Sens. Susan Collins and Lamar Alexander (Photo: Gregory Rec / Portland Press Herald via Getty Images)

This week is likely Congress' last chance to pass legislation stabilizing the Affordable Care Act's insurance markets, and it's anyone's guess what lawmakers will end up doing. On top of the political uncertainty, the policies they're considering are more complicated than they seem, and the results could be a mixed bag.

Why it matters: What Congress does here will have a big impact on millions of people's insurance premiums, and on insurance companies' decisions about whether to keep participating in these markets.