Airline travel and car rentals are complement goods. What happens first when the price of airline travel increases?
A. The demand curve for car rentals shifts to the right.
B. The demand curve for car rentals shifts to the left.
C. The quantity of car rentals demanded goes down.
D. The quantity of car rentals demanded goes up.

D. The quantity of car rentals demanded goes up.

Explanation:

Complimentary goods are products that are used together. If Airline travel and car rentals are complementary goods, it means the two products must be used together. Either of the products will not add much value to the customer if purchased alone.  

Complimentary products have a joint demand. An increase in demand for one good leads to an increase in demand for the other product. If the demand for Airline travel rises, the demand for car rentals also increases. A decrease in demand will have similar effects.

a manufacturer of printed circuit boards uses exponential smoothing with trend to forecast monthly demand of its product. at the end of december, the company wishes to forecast sales for january. the estimate of trend through november has been 200 additional boards sold per month. average sales have been around 1000 units per month. the demand for december was 1100 units. the company uses α = 0.20 and β = 0.10. make a forecast including trend for the month of january.

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