If air travel and bus travel are substitutes,

a. an increase in the price of bus travel will decrease the demand for air travel.
b. a decrease in the price of bus travel will decrease the demand for air travel.
c. an increase in the price of bus travel will generally have no effect on the demand for air travel.
d. an increase in the price of bus travel will shift the demand curve for air travel to the left.


B

Economics

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