单项选择题

Which of the following examples BEST reflects a cost to society as defined in the passage

A．A family buying a dog.
B．Eating in a restaurant instead of at home.
C．Using land for a house instead of a park.
D．Staying at home instead of going to school.

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单项选择题

What determines the price of a good in a market economy

A．The cost of all elements in production.
B．The cost of not making other goods.
C．The efficiency of the manufacturing process.
D．The quantity of materials supplied.

单项选择题

According to the passage, what are the opportunity costs of an item

A．The amount of time and money spent in producing it.
B．The opportunities a person has to buy it.
C．The value of what could have been produced instead.
D．The value of the resources used in its production.