Final answer:
The aggregate demand (AD) curve is downward sloping due to the wealth effect, interest rate effect, and foreign price effect.
Step-by-step explanation:
The aggregate demand (AD) curve is downward sloping because of three main reasons:
- The wealth effect: When the price level (p) decreases, the real value of money increases, which leads to an increase in consumption. This results in higher aggregate demand and output.
- The interest rate effect: When the price level decreases, the demand for money decreases. This reduces interest rates, leading to increased investment spending and higher output.
- The foreign price effect: When the price level decreases, domestic goods become relatively cheaper compared to foreign goods, boosting exports and increasing aggregate demand.