Which of the following is a characteristic of a competitive market（）
A. There are many buyers but few sellers
B. Firms sell differentiated products
C. There are many barriers to entry
D. Buyers and sellers are price takers
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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
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
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