This graph shows the quantity of t-shirts demanded at D and D1.The change in quantity demanded caused by a change in the price of t‐shirts is shown as

A change in the price of t-shirts changes the quantity demanded, shown by moving from one point to another on the same demand curve. A shift of the demand curve represents a change in demand caused by a factor other than the good’s own price. The correct choice is “movement along the demand curve.”

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