TY - JOUR AU - Pindyck,Robert S. AU - Solimano,Andres TI - Economic Instability and Aggregate Investment JF - National Bureau of Economic Research Working Paper Series VL - No. 4380 PY - 1993 Y2 - June 1993 UR - http://www.nber.org/papers/w4380 L1 - http://www.nber.org/papers/w4380.pdf N1 - Author contact info: Robert S. Pindyck MIT Sloan School of Management 100 Main Street, E62-522 Cambridge, MA 02142 Tel: 617/253-6641 Fax: 617/258-6855 E-Mail: RPINDYCK@MIT.EDU Andres Solimano E-Mail: asolimano@eclac.cl M1 - published as Robert S. Pindyck, Andrés Solimano. "Economic Instability and Aggregate Investment," in Olivier Jean Blanchard and Stanley Fischer, editors, "NBER Macroeconomics Annual 1993, Volume 8" MIT Press (1993) AB - A recent literature suggests that because investment expenditures are irreversible and can be delayed, they may be highly sensitive to uncertainty. We briefly summarize the theory, stressing its empirical implications. We then use cross-section and time-series data for a set of developing and industrialized countries to explore the relevance of the theory for aggregate investment. We find that the volatility of the marginal profitability of capital - a summary measure of uncertainty - affects investment as the theory suggests, but the size of the effect is moderate, and is greatest for developing countries. We also find that this volatility has little correlation with indicia of political instability used in recent studies of growth, as well as several indicia of economic instability. Only inflation is highly correlated with this volatility, and is also a robust explanator of investment ER -