Sources of sectoral fluctuations in business fixed investment

A model of macroeconomic complementarity is used to assess causes of comovement in investment spending across nine sectors of the U.S. economy. It is hypothesized that the irreversibility and uncertainty of investment spending imply a greater role for investment linkages and aggregate factors in investment fluctuations compared with estimates for employment and output. For the average sector, past investment growth across all sectors, changes in aggregate demand, and a common factor account for two-thirds of the variance of investment growth. After accounting for aggregate demand, sectoral shocks explain 70% of the average sector’s innovations to investment growth.