A rational buyer or seller will continue to acquire information

without limit.
as long as the information is correct.
as long as the additional information extends his choices.
until the additional cost of getting information exceeds the additional benefit of the information.


From an economic point of view, the best amount of police protection is the amount where:

there is no more crime.
the total benefit of police protection equals its total cost.
the average benefit of police protection equals its average cost.
the marginal benefit of police protection equals its marginal cost.


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