Answer:
The answer is: b
Step-by-step explanation:
Business cycles are the cumulative periods of expansion, contraction, recession and recovery in an economy. These periodic fluctuations can be observed via analysing the real output produced by a country within a specified period. These fluctuations occur in a period of 5 years or less. The aggregate demand- aggregate supply model is a macroeconomic model that examines the relationship between real output and prices. This model provides a basis of examining both short run as well as long run changes in a country's national output.