Output Gaps and Potential Output

Potential output is what an economy can produce when it's using its labor and capital at normal, sustainable rates — full employment, no idle factories, but also no one running triple shifts forever. It's a long-run benchmark, set by the quantity of resources and the technology available to combine them. Actual real GDP, what the economy really produces in a given year, bounces around that benchmark as the business cycle moves through booms and slumps.

The output gap is actual real GDP minus potential output. When actual output falls short, the gap is negative — a recessionary gap, meaning resources sit idle and unemployment runs above its natural rate. When actual output exceeds potential, the gap is positive — an inflationary gap, meaning the economy is pushing resources harder than it can sustain, which tends to pull prices upward. A boom can genuinely push actual GDP above potential for a while: factories run overtime, workers take on extra hours, retirees come back to work. None of that is sustainable, which is exactly why potential output isn't the economy's hard ceiling — it's the pace the economy can keep up without accelerating inflation.

The output gap connects directly to unemployment through Okun's rule of thumb: every 1 percentage point that actual output falls below potential corresponds to roughly a 2 percentage point rise in the unemployment rate above its natural rate. That link ties this topic straight to cyclical unemployment and sets up the next piece of the business cycle story, where policymakers try to close these gaps with fiscal and monetary tools.