We analyze recent contributions to growth theory based on the model of expanding variety of Romer [Romer, P. (1990). “Endogenous technological change”. Journal of Political Economy 98, 71–102]. In the first part, we present different versions of the benchmark linear model with imperfect...

Financial integration generates macroeconomic spillovers that may require international monetary policy coordination. We show that individual central banks may set nominal interest rates too low or too high relative to the cooperative outcome. We identify three sufficient statistics that...

The ability of discretionary fiscal policy to affect economic activity following shocks depends on how private agents react. This paper re-investigates the extent of possible offsetting private saving behaviour to fiscal policy changes. The results suggest that the private saving offset is...

The Fiscal Theory of the Price Level (FTPL) is a promise to obtain price level determinacy even if the nominal interest rate is constant. The idea is that a unique current price level ensures that the present value government budget constraint holds. I establish that this idea hinges on the...

The wealthy hand-to-mouth are households who hold little or no liquid wealth (cash, checking, and savings accounts), despite owning sizable amounts of illiquid assets (assets that carry a transaction cost, such as housing or retirement accounts). We use survey data on household portfolios for...