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Consider Darrells Engel curve below for pairs of shoes. Note that at $0$ income, Darrell buys $0$ pairs of shoes.

If Darrell's income doubles, how will the amount of shoes he purchases change?

A

Darrell buys two more pairs of shoes.

B

The amount of shoes that Darrell buys increases by 50\%.

C

Darrell buys half as many shoes.

D

Darrell buys twice as many shoes.

E

There is not enough information to tell.

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