Final answer:
The AD-AS model is often used to describe the business cycle by analyzing the intersection of the aggregate demand and aggregate supply curves.
Step-by-step explanation:
The AD-AS model is often used to describe what is happening in the business cycle. The model consists of the aggregate demand (AD) curve and the aggregate supply (AS) curve. The AD curve represents the total demand for goods and services in an economy, while the AS curve represents the total supply. By analyzing the intersection of these two curves, economists can understand how changes in factors like inflation, unemployment, and economic growth affect the business cycle.