NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Spontaneous Volatility of Output and Investment

Robert E. Hall

NBER Working Paper No. 3144*
Issued in October 1989
NBER Program(s):   EFG

Spontaneous shifts in output originating within the business sector

are an important factor in aggregate fluctuations. This paper

develops a simple two-component decomposition of the movement

of real GNP. One component is the path that GNP would have

followed in order to deliver the volume of goods and services

actually taken by consumers, government, and the rest of the

world. The second component, noise, is the residual between

actual GNP and the theoretical calculation. The two components

are of roughly the same size, but noise has more of its power at

higher frequencies.

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