Variable inflation rates may be more costly socially than low but predictable rates of inflation

In an unregulated competitive market, the presence of marginal external benefit from a good or service results in less than the efficient quantity being produced

Indicate whether the statement is true or false

United Parcel Service and other parcel post carriers have expanded in part because

a. the U.S. Postal Service licensed them the right to deliver first-class mail b. Congress gave patents to these companies c. the U.S. Postal Service does not have a monopoly on all types of mail d. the telephone has replaced the letter as a means of correspondence e. Congress has all but eliminated funding for the U.S. Postal Service