Short-term price rigidity in an endogenous growth model: Non-Superneutrality and a non-vertical long-term Phillips-curve

This model analyses the interaction between inflation and the long-run levels of employment and output growth in a Schumpeterian growth model with quality improving innovations under nominal price rigidity. At the unique REE steady state equilibrium, both employment and growth are hump-shaped functions of money growth peaking at positive inflation rates. This is due to four effects of money growth under rigidity: Erosion of its relative price through inflation and the optimal initial mark-up set in anticipation of this influence a firm’s profits. Dispersion in relative prices causes inefficient production while the change in the average mark-up influences aggregate demand.