A Change in the Quantity Demanded Versus a Change in Demand
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The demand curve isolates the impact of price on the amount of a product purchased.
- A change in quantity demanded (caused by price change ONLY) is a movement along a demand curve from one point to another.
- Changes in other factors (anything other than price), such as income, tastes, expectations, and the prices of closely related goods, will shift the entire demand curve inwards or outwards. This is referred to as change in demand.
Example 3
Refer to the graph below. Consumers began purchasing more of a product due to a decrease in price. Which arrow best represents this statement?
Answer: C. A change in price causes a movement along the demand curve. When price falls, the movement is downward and to the right.