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...Nber working paper series gravity for dummies and equations richard baldwin daria taglioni http www org papers w national bureau of economic research massachusetts avenue cambridge ma september we thank thierry meyer volker nitsch rob feenstra helpful feedback this reflects views the authors which do not necessarily correspond with those ecb nor imply expression any opinion whatsoever on part expressed herein are author s reflect by all rights reserved short sections text to exceed two paragraphs may be quoted without explicit permission provided that full credit including notice is given source no jel f abstract provides a minimalist derivation equation uses it identify three common errors in literature what call gold silver bronze medal estimates size biases taking currency union trade effect as an example generalize anderson van wincoop multilateral resistance factor only works cross section data allow panel then show can dealt using time varying country omitted determinants bilater...