The development of e-mail and fax machines has reinforced the U.S. Postal Service's monopoly of first-class letter mail.

Name: The development of e-mail and fax machines has reinforced the U.S. Postal Service's monopoly of first-class letter mail.
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Question

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The development of e-mail and fax machines has actually decreased the volume of first-class letter mail, challenging the U.S. Postal Service's traditional role and revenue from this service.

The Development of E-Mail and Fax Machines Has Reinforced the U.S