This paper investigates the sensitivity of Solow residual based measures of technology shocks to labor hoarding behavior. Using a structural model of labor hoarding and the identifying restriction that innovations to technology shocks are orthogonal to innovations in government consumption, it estimates the fraction of the variability of the Solow residual that is due to technology shocks. Results support the view that a significant proportion of movements in the Solow residual are artifacts of labor hoarding behaviour. Specifically, the variance of innovations to technology is roughly 50% less than that implied by standard real business cycle models. In addition, results suggest that existing real business cycle studies substantially overstate the extent to which technology shocks account for the variability of postwar aggregate US output. -Author