What does the term "change in demand" signify?

The term "change in demand" signifies a shift in the demand curve due to various factors affecting consumer preference. When there is a change in demand, it means that consumers are willing to purchase different quantities of a good or service at every price level, which is represented graphically by the entire demand curve moving to the left or right.

This shift can occur due to a variety of factors, such as changes in consumer preferences, income levels, prices of related goods (substitutes and complements), expectations about future prices, and demographic changes. For instance, if a popular trend increases consumers' preferences for a product, the demand curve for that product would shift to the right, indicating that more of the product is demanded at each price point.

In contrast, movement along the demand curve, which is described in another choice, occurs solely due to a change in the price of the good itself, reflecting a change in the quantity demanded rather than a fundamental change in demand. Other options either misinterpret the concept of demand or pertain to conditions that do not reflect a shift in the demand curve itself.