关于 opportunity cost

问题描述:

关于 opportunity cost
In the production of a movie,a famous actor has to perform a dangerous action.The production company additonally employs a substitute to replace the actor in performing the dangerous action.
1)Define opportunity cost.
2)Using the concept of opportunity cost,explain why a substitute is additionally employed to replace the famous actor in performing the dangerous action.
please use english

(1)opportunity cost means that when you choose one thing,you should give up others that come forth during the period.So you should balance its weigh and make a more benefit and vise choose!
DUE TO THE FACT THAT I AM NOT FAMILIAR WITH ECONOMICS,SO I CAN NOT FINISH QUESTION2.