Could the Great Depression have been forecasted if the time series forecasting techniques that are now available had been available in the 1920s? To address this question, Dominguez, et al. used only extrapolation techniques. That is, no causal methods were considered. What would you expect? Well, an alternative subtitle for this paper could have been Harvard 0, Yale 0. The sophisticated techniques did not help. Optimism about the economy would still have prevailed had these sophisticated methods been used. In light of research that has compared sophisticated with simple extrapolations, I do not think it is reasonable to expect that these sophisticated methods would have forecasted more accurately. This result is consistent, then, with prior research on the value of sophisticated versus simple extrapolations; sophistication, beyond a certain point, does not improve the accuracy of forecasts. Armstrong (1984) summarizes this research. It would have been more interesting to see if an econometric model would have provided more accurate forecasts. Existing research suggests that it would (Fildes, 1985), assuming that sufficient data would have be available. Finally, the authors claim that the actions of the Federal Reserve Board could not have been predicted. I believe that role playing techniques may have been able to provide useful predictions of how this group would have acted (Armstrong, 1987).