In the comments, Wolfgang says: ...the problem is that there were also economists that predicted that the stimulus program would not work. So how do you distinguish 'not big enough' from 'would not work' ? By the way, i am of the opinion that TARP and various Fed programs had a big positive impact, but the Obama stimulus program made no significant difference (except increasing the deficit). How do you evaluate such an opinion? Good question, but how about explaining your reasoning in so concluding? Opinions, mine anyway, can be cheap, but evidence is pricier, as WB points out. One of the things that makes economics seem more like a religion than a science is the fact that economists seem unable to agree even on most of the basic kinds of evidence. In my opinion, the direct effect of the stimulus looks fairly easy to calculate: x-dollars went out the door, y people got or kept jobs as a result. Positive feedback is only slightly harder - the people hired spent mone...