"With the states' individual markets remaining upright despite repeated pounding, it has become clear that the Affordable Care Act's premium tax credits have acted as a central stabilizing force," write the Commonwealth Fund's Sara Collins and Munira Gunja on To the Point. Despite attempts by the Trump administration and Congress over the last year to weaken the health care law, data show not only that enrollment in the health insurance marketplaces is higher in 2018 than last year, but that this year is shaping up to be the most profitable one ever for insurers selling plans in the individual market.