基礎econ-u01-d01
When the price of bubble tea rises and nothing else changes, quantity demanded of bubble tea usually:
A. Falls, as a movement along the same demand curve✓ 答案
B. Rises, because the whole demand curve shifts right
C. Becomes infinite at the new price
D. Stays unchanged, because demand only reacts to income
解說
A change in the good's own price moves you along the demand curve; it does not shift the curve. The curve shifts when a non-price determinant changes, such as income, tastes, related-goods prices or expectations.