Which of the following is not an example of derived demand? A

Subject:EconomicsPrice:2.88 Bought3

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Which of the following is not an example of derived demand?

A. Increased demand for overnight delivery speeds up orders for new delivery trucks.

B. As people let their hair grow longer, fewer people become barbers.

C. As more high school graduates go on to college, more professors are hired.

D. As consumers buy more computers, they demand more powerful computers as they become available.

E. As people buy more tennis shoes instead of sandals, they buy more shoe laces.