When there are externalities, economic efficiency can be achieved without government intervention
A. at no time.
B. when the externality affects many people and property rights are not well defined.
C. when the externality affects many people and property rights are well defined.
D. when the externality affects only a few parties and property rights are not well defined.
E. when the externality affects only a few parties and property rights are well defined.
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Common property rights
A. increase efficiency over individual property rights.
B. enable the Coase theorem to work.
C. are responsible for the increasing success of preservation of African elephants.
D. are responsible for the increasing success of preservation of worldwide fishing resources.
E. result in faster depletion of resources than do individual property rights.
Which of the following move the handling of a common property resource closest to efficiency?
A. ensuring that the sellers of the resource are perfectly competitive
B. ensuring that the seller of the resource is a monopolist
C. banning the sale of the resource
D. banning the use of the resource
E. assigning a usage fee for access to the resource
Common property resources tend to be
A. overused.
B. underused.
C. not used at all.
D. efficiently used.
E. used by the government only.
关于原核细胞型微生物的描述,错误的是()
A. 原始核呈环状裸DNA团块结构
B. 无核膜、核仁
C. DNA和RNA同时存在
D. 核酸类型为DNA或RNA,两者不同时存在
E. 细胞器很不完善,只有核糖体
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