What is the term for the movement along the demand curve for gasoline when its price changes?

The term that describes the movement along the demand curve for gasoline when its price changes is indeed a change in quantity demanded. This concept refers specifically to the response of consumers to a change in price while all other factors influencing demand remain constant.

When the price of gasoline increases, consumers typically purchase less of it, moving up along the demand curve. Conversely, if the price decreases, they tend to buy more and move down along the curve. This reflects the law of demand, which states that, all else being equal, an increase in the price of a good results in a decrease in quantity demanded, and a decrease in the price leads to an increase in quantity demanded.

In contrast, a change in demand would suggest that the entire demand curve has shifted due to changes in factors such as consumer preferences, income levels, or the prices of related goods. A change in supply would refer to alterations in factors that affect supply rather than demand. A permanent shift of the curve indicates a fundamental change in market conditions, also unrelated to just a price change. Thus, the correct response pertains specifically to the movements along the demand curve as prices fluctuate, indicating varying quantities demanded at those different price points.