Intangible Capital and Measured Productivity

Because ?rms invest heavily in R&D, software, brands, and other intangible assets?at a rate close to that of tangible assets?changes in measured GDP, which does not include all intangible investments, understate the actual changes in total output. If changes in the labor input are more precisely measured, then it is possible to observe little change in measured total factor productivity (TFP) coincidentally with large changes in hours and investment. This mismeasurement leaves business cycle modelers with large and unexplained labor wedges accounting for most of the ?uctuations in aggregate data. To address this issue, I incorporate intangible investments into a multi-sector general equilibrium model and parameterize income and cost shares using data from an updated U.S. input and output table, with intangible investments reassigned from intermediate to ?nal uses. I employ maximum likelihood methods and quarterly observations on sectoral gross outputs for the United States over the period 1985?2014 to estimate processes for latent sectoral TFPs?that have common and sector-speci?c components. Aggregate hours are not used to estimate TFPs, but the model predicts changes in hours that compare well with the actual hours series and account for roughly two-thirds of its standard deviation. I ?nd that sector-speci?c shocks and industry linkages play an important role in accounting for ?uctuations and comovements in aggregate and industry-level U.S. data, and I ?nd that the model?s common component of TFP is not correlated at business cycle frequencies with the standard measures of aggregate TFP used in the macroeconomic literature.