Because if a price level is higher for a good, aggregate spending will decrease as the level of the price increases. And vice versa - the cheaper a good is, OR the MORE that your money will buy, the more likely you are to spend that money.
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An increase in the nation's money supply lowers interest rates, thus decreases the cost of doing business. With a higher return on investment, investment spending increases and so too does aggregate supply. As aggregate supply increases, aggregate demand increases and so prices go up. Thus real GDP and APL increase.
The equilibrium price level increases, but the real GDP change depends on how much aggregate demand and aggregate supply change by.
Aggregate demand refers to the total amount of goods and services that consumers, businesses, and the government are willing to buy at a given price level. It directly affects the level of economic activity, as measured by Gross Domestic Product (GDP). When aggregate demand increases, businesses produce more to meet the higher demand, leading to economic growth and an increase in GDP. Conversely, a decrease in aggregate demand can lead to a slowdown in economic activity and a decrease in GDP.
aggregate demand will decrease, lowering both real GDP and the price level
Movements along the aggregate demand curve are caused by changes in price level - real wealth effect, interest rate effect and open economy effect. If some non-price level determinant causes total spending to increase/decrease then the curve will shift to the right/left - consumption, investment, government expenditure, net exports.