Jesus Fernandez-Villaverde is a professor of economics and director of graduate studies of economics at the University of Pennsylvania. He joins the show to discuss both his extensive work in economic history as well as macroeconomic modeling. David and Jesus discuss the economic history of Germany in the 1920s and 1930s and the events that led to the rise of the Nazis as well as more recent events such as the struggles facing the Eurozone. They also discuss debates surrounding the usefulness of current-day macroeconomic models.