Explain the difference between a change in quantity demanded and a change in demand.

### The concept A demand curve shows quantities consumers are willing and able to buy at different own prices during a period. If the good’s own price changes, the consumer moves to another point on the same curve; this is a change in quantity demanded. If income, tastes, or the price of a substitute or complement changes, the quantities desired at different own prices change. The entire curve shifts, which is a change in demand. This distinction matters because the two changes have different causes. ### What a good answer covers - Identify own price as the cause of movement along the curve. - Identify non-price determinants as causes of curve shifts. - Give at least one example of a demand shifter. - Use the terms “quantity demanded” and “demand” distinctly. ### Remember Own-price change: move along. Other demand determinant: shift.