Step 1: Define full employment:
Full employment is the situation in which all persons who are willing and able to work at the prevailing wage rate are able to find work — there is no involuntary unemployment. (Some frictional/voluntary unemployment — people between jobs or choosing not to work at that wage — can still exist even under "full employment".) In macroeconomic terms, it corresponds to the output level at which Aggregate Demand exactly equals Aggregate Supply, with neither a deflationary nor an inflationary gap.
Step 2: Adequate and stable aggregate demand:
AD must be just sufficient to purchase the full-employment level of output — neither deficient (which causes unemployment) nor excessive (which causes inflation without raising real output/jobs further).
Step 3: Appropriate monetary policy:
Interest rates and credit availability must be conducive to steady investment — neither so tight that firms can't expand hiring, nor so loose that it fuels unsustainable inflation.
Step 4: Appropriate fiscal policy:
Government spending and taxation must be calibrated to support demand during slack periods (counter-cyclical spending) without causing runaway deficits or crowding out private investment.
Step 5: Business/investment climate:
Confidence among entrepreneurs, ease of doing business, and political-economic stability encourage firms to invest and expand employment.
Step 6: Price stability:
Moderate, predictable inflation supports planning and investment; runaway inflation or deflation both discourage the steady investment needed to sustain full employment.
Step 7: Skilled and adaptable labour force:
Workers' skills must reasonably match the jobs the economy is creating; a large skills mismatch leads to structural unemployment even when overall demand is adequate.
Step 8: Adequate infrastructure:
Reliable power, transport, and communication infrastructure keeps production costs manageable and supports continuous business operation and hiring.
Final Answer:
Full employment means no involuntary unemployment (AD = full-employment AS); it depends on adequate aggregate demand, sound monetary and fiscal policy, a healthy investment climate, price stability, a well-matched skilled workforce, and good infrastructure.