In tackling questions about the long-run effects on prices and outputs of specified changes in wants, resources, technology, and legislation, one may legitimately neglect intervening disequilibrium to get on with the analysis. But when questions of macroeconomics are at issue—essentially, questions concerning disruptions or imperfections or delays in processes working to coordinate the plans and activities of many different people—then attention properly turns to how quickly and smoothly markets respond when disturbed, to transitional stages, and to the frictions of reality.
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