Roughly speaking, 20 million Americans gained coverage at a cost of around 0.6 percent of GDP.
.. Taken together, these moves would almost surely lead to a death spiral. Healthy individuals, especially low-income households no longer receiving adequate aid, would opt out, worsening the risk pool. Premiums would soar – without the cushion created by the current, price-linked subsidy formula — leading more healthy people to exit. In much of the country, the individual markets would probably collapse.
The House leadership seems to realize all of this; that’s why it reportedly plans to rush the bill through committee before CBO even gets a chance to score it.