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Real business-cycle theory (RBC theory) are a class of new classical macroeconomics model in which business-cycle fluctuations to a large extent can be accounted for by real (in contrast to nominal) shock. Unlike other leading theories of the business cycle, RBC theory sees business cycle fluctuations as the efficient response to exogenous changes in the real economic environment. That is, the level of national output necessarily maximizes expected utility, and governments should therefore concentrate on long-run structural policy changes and not intervene through discretionary fiscal or monetary policy designed to actively smooth out economic short-term fluctuations
