To decide which of these studies is more credible, three questions should be asked: First, is the model that is used appropriate for exploring trade policy? Second, has the TPP been depicted in that model in a sensible way? And third, are the results of the model credible? I argue not only that the PP model is superior on all counts but also that whatever the merits of the model used by GDAE, it is simply not suited for credibly predicting the effects of the TPP.
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