Asymmetric cycles

"I estimate a model in which new technology entails random adjustment costs. Rapid adjustments may cause productivity slowdowns. These slowdowns last longer when retooling is costly. The model explains why growth-rate disasters are more likely than miracles, and why volatility of growth relates negatively to growth over time. I estimate the model, and the estimates have surprising implications. Firms seem to abandon technologies long before they are perfected current-practice TFP is 17 percent below best-practice"--National Bureau of Economic Research web site.