What is the difference between change in quantity demanded and change in demand?

The difference between a change in quantity demanded and a change in demand is a fundamental concept in economics, often related to how consumers respond to price changes and other factors. Here's a concise explanation:

Change in Quantity Demanded

• Definition: A change in quantity demanded refers to a movement along the demand curve due to a change in the price of the good or service.
• Cause: It is caused solely by a change in the price of the product.
• Graphical Representation: This is represented as a movement along the same demand curve. For example, if the price decreases, the quantity demanded increases, and vice versa.

Change in Demand

• Definition: A change in demand refers to a shift of the entire demand curve, either to the right or left.
• Cause: It is caused by factors other than the price of the product, such as changes in consumer preferences, income levels, prices of related goods (substitutes or complements), expectations, and demographic changes.
• Graphical Representation: This is represented as a shift of the demand curve. A rightward shift indicates an increase in demand, while a leftward shift indicates a decrease in demand.

Summary

• Change in Quantity Demanded: Movement along the curve due to price changes.
• Change in Demand: Shift of the entire curve due to non-price factors.