By the end of the debt-ceiling negotiations, the Obama administration had agreed to a deal that would reduce the deficit by $2.4 trillion, with $2 trillion of the total coming from spending cuts and $400 billion coming from tax increases. Taxes, in other words, would be about 17 percent of the final deal. Republicans rejected it. But as little as four months ago, it was the Republican ideal.

Mike Konczal points us to “Spend Less, Owe Less, Grow the Economy,” the March 2011 report released by the Republicans on the Joint Economic Committee. The report, which tried to argue that fiscal austerity would lead to short-term growth, was as methodologically unsound, and quickly forgotten. But for our purposes, that’s irrelevant. What is relevant is the report’s golden ratio: “successful fiscal consolidations averaged 85% spending cuts and 15% revenue increases, while unsuccessful fiscal consolidations averaged 47% spending cuts and 53% revenue increases,” it concluded. There was even a graph:

So when the GOP’s economic policy team sat down to make the strongest case they could for growth-inducing deficit reduction, they recommended a mix an 85:15 mix, not a 100:0 mix. And then, when the Obama administration agreed to an 83:17 mix, the Republican leadership walked out of the room and demanded that taxes be excluded from the deal altogether. How do you negotiate with that?