When buyers in a competitive market take the selling price as given, they are said to be（）
A. market entrants
B. monopolists
C. free riders
D. price takers
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The provision of public goods gives rise to（）
A. no externalities
B. positive externalities
C. negative externalities
D. rivalries in consumption
When goods do not have a price, which of the following primarily ensures that the good is produced（）
A. buyers
B. sellers
C. government
D. the market
Which of the following statements about a well-maintained yard best conveys the general nature of the externality（）
A well-maintained yard conveys a positive externality because it increases the home’s market value
B. A well-maintained yard conveys a negative externality because it increases the property tax liability of the owner
C. A well-maintained yard conveys a positive externality because it increases the value of adjacent properties in the neighborhood
D. A well-maintained yard cannot provide any type of externality
Altering incentives so that people take account of the external effects of their actions（）
A. is called internalizing the externality
B. can be done by imposing a corrective tax
C. is the role of government in markets with externalities
D. all the answers are correct
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