The U.S. Postal Service has a monopoly over first-class mail delivery

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The U.S. Postal Service has a monopoly over first-class mail delivery because of government-imposed barriers to entry. The Postal Reorganization Act of 1970 granted the USPS a legal monopoly over the delivery of letter mail, allowing it to be the only carrier of mail letters in the United States. This was done to ensure universal mail service and prevent inefficient competition among mail carriers.

The US Postal Service Has a Monopoly Over First-Class Mail Delivery