The full employment level of national income is the total output produced when all available resources, especially labor, are used at their normal capacity. It represents the maximum sustainable level of production in an economy.

Key features include:

• Not zero unemployment: It allows for frictional unemployment (people changing jobs) and structural unemployment (skills or location mismatch). This is known as the natural rate of unemployment.
• Aggregate Supply (AS): This level is shown where the long-run aggregate supply curve becomes vertical.
• Potential Output: The economy operates at its potential output (Y*), which is the maximum production possible without causing high inflation.
• Equilibrium gaps: If the current national income is below this level, there is a deflationary gap. If it is above this level, it causes the economy to overheat, leading to demand-pull inflation or an inflationary gap.
• Policy targets: Governments use fiscal and monetary policy to help the economy reach this sustainable level.
• Variations: This level changes over time based on population, labor skills, and education systems.