The full-employment level of real output is the maximum quantity of goods and services an economy can produce when utilizing all its resources efficiently, without causing inflationary pressures. This level reflects the productive capacity of an economy when it operates at natural unemployment, meaning that all individuals who are willing and able to work are employed, excluding frictional and structural unemployment. It is crucial for understanding equilibrium in the aggregate demand-aggregate supply model, as it indicates where the economy ideally wants to be in terms of output.