Technological Innovation, Intangible Capital, and Asset Prices

We review research on the asset pricing implications of models with innovation and intangible capital. In these models, technological innovation shocks propagate differently than standard total factor productivity shocks—and therefore have qualitatively distinct asset pricing implications. We discuss recent approaches to measuring intangible capital and innovation, many of which rely on the prices of financial securities. Last, we review models that explore the economic differences between intangible and innovation relative to other forms of investments—focusing on the role of human capital and cash-flow appropriability.

Market Exposure and Endogenous Firm Volatility over the Business Cycle

We propose a theory of endogenous firm-level risk over the business cycle based on endogenous market exposure. Firms that reach a larger number of markets diversify market-specific demand shocks at a cost. The model is driven only by total factor productivity shocks and captures the observed countercyclity of firm-level risk. Using a panel of US firms we show that, consistent with our theoretical model, measures of market reach are procyclical, and the counter-cyclicality of firm-level risk is driven by those firms that adjust their market exposure, which are larger than those that do not. (JEL D21, D22, E23, E32, L25)

Can News about the Future Drive the Business Cycle?

Aggregate and sectoral comovement are central features of business cycles, so the ability to generate comovement is a natural litmus test for macroeconomic models. But it is a test that most models fail. We propose a unified model that generates aggregate and sectoral comovement in response to contemporaneous and news shocks about fundamentals. The fundamentals that we consider are aggregate and sectoral total factor productivity shocks as well as investment-specific technical change. The model has three key elements: variable capital utilization, adjustment costs to investment, and preferences that allow us to parameterize the strength of short-run wealth effects on the labor supply. (JEL E13, E20, E32)