Full-employment output refers to the level of production achieved when an economy operates at its full capacity, utilizing all available resources without causing inflation. This concept is closely linked to the Long-Run Aggregate Supply (LRAS), which is vertical at this output level, indicating that in the long run, the economy can produce this output regardless of the price level. At full-employment output, the economy is considered to be at a natural rate of unemployment, where only frictional and structural unemployment exists.