The most important question facing Obama that day was how large the stimulus should be. Since the election, as the economy continued to worsen, the consensus among economists kept rising. A hundred-billion-dollar stimulus had seemed prudent earlier in the year. Congress now appeared receptive to something on the order of five hundred billion. Joseph Stiglitz, the Nobel laureate, was calling for a trillion. Romer had run simulations of the effects of stimulus packages of varying sizes: six hundred billion dollars, eight hundred billion dollars, and $1.2 trillion. The best estimate for the output gap was some two trillion dollars over 2009 and 2010. Because of the multiplier effect, filling that gap didn’t require two trillion dollars of government spending, but Romer’s analysis, deeply informed by her work on the Depression, suggested that the package should probably be more than $1.2 trillion. The memo to Obama, however, detailed only two packages: a five-hundred-and-fifty-billion-dollar stimulus and an eight-hundred-and-ninety-billion-dollar stimulus. Summers did not include Romer’s $1.2-trillion projection. The memo argued that the stimulus should not be used to fill the entire output gap; rather, it was “an insurance package against catastrophic failure.” At the meeting, according to one participant, “there was no serious discussion to going above a trillion dollars.”
Summers brought a third argument to the debate, one that echoed his advice to Bill Clinton sixteen years earlier, when his Administration was facing persistent budget deficits that Summers believed were suppressing economic growth. He, like Romer, was guided by an understanding that in financial crises the risk of doing too little is greater than doing too much. He believed that filling the output gap through deficit spending was important, but that a package that was too large could potentially shift fears from the current crisis to the long-term budget deficit, which would have an unwelcome effect on the bond market. In the end, Summers made the case for the eight-hundred-and-ninety-billion-dollar option.
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