Does Lumpy Investment Matter for Business Cycles?
Boston University - Department of Economics
Department of Economics, HKUST
April 21, 2009
We present an analytically tractable general equilibrium business cycle model that features micro-level investment lumpiness. We prove an exact irrelevance proposition which provides sufficient conditions on preferences, technology, and the fixed cost distribution such that any positive upper support of the fixed cost distribution yields identical equilibrium dynamics of the aggregate quantities normalized by their deterministic steady state values. We also give two conditions for the fixed cost distribution, under which lumpy investment can be important: (i) The steady-state elasticity of the adjustment rate is large so that the extensive margin effect is large. (ii) More mass is on low fixed costs so that the general equilibrium price feedback effect is small. Our theoretical results may reconcile some debate and some numerical findings in the literature.
Number of Pages in PDF File: 46
Keywords: generalized (S,s) rule, lumpy investment, general equilibrium, business cycles, marginal Q, exact irrelevance proposition
JEL Classification: E22, E32working papers series
Date posted: April 24, 2009
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