In the article I examine how model builders from the academia and from the Federal Reserve Board confronted the Phillips curve in the construction and subsequent modifications of the Federal Reserve, MIT, and University of Pennsylvania macroeconometric model. It is argued that academic debates on Milton Friedman’s and Edmund Phelps’s accelerationist hypothesis, and the evolution of the macroeconomics discipline, did not affect the model-building agenda at the Division of Research and Statistics at the Board over the 1970s and 1980s.