Search Frictions in Physical Capital Markets as a Propagation Mechanism

We build a Dynamic General Equilibrium model with search frictions for the allocation of physical capital and investigate its implications for the business cycle. While the model is in principle capable of generating substantial internal propagation to small exogenous shocks, the quantitative effects are modest once we calibrate the model to fit firm-level capital flows. We then extend the model with credit market frictions that lead to countercyclical default and countercyclical risk premia as in the data. Countercyclical default directly affects capital reallocation and has important general equilibrium income effects on labor supply. Yet, for calibrations in line with observed consumption dynamics, we find that even in this extended model, search frictions in physical capital markets play only a small role for business cycle fluctuations.