[問題]OG(11th) Q98

[GuDon]

98. Hotco oil burners, designed to be used in asphalt plants, are so efficient that Hotco will sell one to the Clifton Asphalt plant for no payment other than the cost savings between the total amount the asphalt plant actually paid for oil using its former burner during the last two years and the total amount it will pay for oil using the Hotco burner during the next two years. On installation, the plant will make an estimated payment, which will be adjusted after two years to equal the actual cost savings.
Which of the following, if it occurred, would constitute a disadvantage for Hotco of the plan described above?
(A)Another manufacturer's introduction to the market of a similarly efficient burner
(B)The Clifton Asphalt plant's need for more than one new burner
(C)Very poor efficiency in the Clifton Asphalt plant's old burner
(D)A decrease in the demand for asphalt
(E)A steady increase in the price of oil beginning soon after the new burner is installed

Ans E

這題答案我了解不過在寫的時候DE很掙扎

(D) If demand decreases, less oil would need to be purchased, and Hotco would get more money.
這是OG上的解釋但是我不懂為什麼demand下降less oil Hotco還會get more money.


請問哪位大大幫我解一下惑 感激不盡