If UPS hires another worker,UPS will be able to deliver an a

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If UPS hires another worker,UPS will be able to deliver an additional 20 packages an
hour.The price of each package is $5.The value of this workerʹs marginal product is equal to ____.
A) $100.
B) $4.
C) $5.
D) 20 packages.
E) $20.

选A,题目上说,再雇佣一个工人每小时可以增加20个包裹,包裹值5美元.就是说再雇佣一个工人可以增加100美元的产量.这个符合边际产量的定义.边际产量的定义就是说每增加一单位该生产要素所能带来的产量的增加量.
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