There is one fact that is both central to the debate over repealing the Affordable Care Act yet strangely absent from explicit discussion about it. One of the main ways the ACA makes health insurance affordable is by providing families earning less than 400 percent of the poverty line (i.e.,less than $85,000 for a family of three or less than $47,550 for a single person) with tax credits to defray the cost of purchasing insurance. Giving people money helps make things more affordable. President Obama and the congressional Democrats who wrote the law didn't find the money for those subsidies hidden in a banana stand — they did what Democrats like to do when paying for things and raised taxes on affluent families. Republicans do not like this idea. They dislike the idea of raising taxes on wealthy households so much that back in 2011, they pushed the country to the brink of defaulting on the national debt rather than agree to rescind George W. Bush's high-end tax cuts. In December 2012, they tried to insist that they wouldn't let Obama extend the portion of the Bush tax cuts that everyone (including rich people) got unless he also extended the tax cuts that only rich people got. All of which is to say that despite Democrats' occasional protestations of bafflement as to why the GOP would so uniformly oppose a market-based approach to universal health care that Mitt Romney happily adopted in the mid-aughts in Massachusetts, there's no real mystery here. Subsidizing the health care costs of working-class people is expensive, and while Democrats want rich people to pay the freight for doing it, Republicans do not. More from Vox:

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How our housing choices make adult friendships more difficult That's an important reason why they opposed the Affordable Care Act, it's an important reason why they want to repeal it, it's an important reason why they can't replace it with something better, and it's also an important reason why they may end up just dropping the whole thing.

Repealing Obamacare is a huge tax cut for the rich

This did not play a major overt public role in the 2009-'10 debate about the law, but the Affordable Care Act's financing rests on a remarkably progressive base. That means that, as the Tax Policy Center has shown, repealing it would shower money on a remarkably small number of remarkably wealthy Americans. The two big relevant taxes, according to the TPC's Howard Gleckman, are "a 0.9 percent payroll surtax on earnings and a 3.8 percent taxon net investment income for individuals with incomes exceeding $200,000($250,000 for couples)." That payroll tax hike hits a reasonably broad swath of affluent individuals, but in a relatively minor way. The 3.8 percent tax on net investment income (money made from owning or selling stocks and other financial instruments rather than working), by contrast, is a pretty hefty tax, but one that falls overwhelmingly on the small number of people who have hundreds of thousands of dollars a year in investment income. For the bottom 60 percent of the population — that is, households earning less than about $67,000 a year — repeal of the ACA would end up meaning an increase in taxes due to the loss of ACA tax credits. But people in the top 1 percent of the income distribution —those with incomes of over about $430,000 — would see their taxes fall by an average of $25,000 a year. And for the true elite in the top 0.1 percent — people like designated White House senior adviser Jared Kushner, Treasury Secretary Steve Mnuchin, Education Secretary Betsy DeVos, Commerce Secretary Wilbur Ross, and many major campaign donors — the tax cut is truly enormous. Households with incomes of more than $1.9 million would get an extra $165,000 a year in take-home pay. That's obviously more than enough money to make these hyper-elite families come out ahead regardless of what happens to health insurance markets. By contrast, upper-middle-class families would get an extra $110 a year in after-tax income. That's nice, but it isn't going to replace a health insurance plan.

This is why Republicans can’t make a better replacement

Republicans have made a lot of political hay out of pointing out that the plans available under the Affordable Care Act are, in many ways,disappointing. Unsubsidized premiums are higher than people would like.Deductibles and copayments are higher than people would like. The networks of available doctors are narrower than people would like. These problems are all very real, and they all could be fixed. They are not, however, problems that any of the GOP replacement plans fix. Instead, while Republican alternatives vary in many important ways, they all fundamentally offer stingier insurance to a narrower group of people. This is because the Republican plans all envision rolling back these ACA taxes. But under those circumstances, it's simply not possible for the GOP to offer people the superior insurance coverage that it is promising. Phil Klein, a top conservative health policy journalist, has urged Republicans to solve their overpromising problem by "stating a simple truth, which goes something like this: 'We don't believe that it is the job of the federal government to guarantee that everybody has health insurance.'"

This is also why Republicans might drop repeal