Which of the following would cause the demand curve to shift from Demand B to
Demand C in the market for bubble gum?
a decrease in the cost of dental procedures
a change in consumer preferences toward eating fruit rather than sweets
a decrease in the price of bubble gum
an increase in the number of people visiting South Africa
Feedback
This question deals with shifts of versus movements along curves. The easiest way
to deal with the distinction between the two is to remember that if there is a change
in price (and only if there is a change in price), we have a change in quantity
demanded. A change in quantity demanded is shown by a movement along the
demand curve. If any of the other determinants of demand change (income, taste,
fashion …) there is a change in demand, which is illustrated by a shift of the demand
curve. An increase in the number of people visiting South Africa leads to an increase
in the demand for bubble gum and the demand curve shifts to the right.
2
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