In long-run equilibrium, purely competitive markets maximize the sum of consumer surplus and producer surplus.
The long run is a theoretical concept in economics where all markets are in equilibrium, all prices have fully adjusted, and all quantities are in equilibrium. The short-run, where there are certain restrictions and markets are not completely in equilibrium, contrasts with the long-run.
An economy is in a recession if its real GDP at the moment is lower than the output at full employment. An economy is in a boom if its real GDP at the moment is higher than its output at full employment. We say the economy is in long-run equilibrium if the current output is equivalent to the output at full employment.
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