One of the mysteries of the English language finally explained.
A class of US mail applying to packages weighing more than sixteen ounces and used especially for sending general merchandise, books, recordings, and films.
- ‘The fourth-class zone rated parcels and first-class mail have virtually identical historical elasticities.’
- ‘The ratio of first - to fourth-class mail increased from about 0.085 in 1970 to over 0.20 in 1998, an increase of more than 150 percent.’
- ‘Bound printed matter is fourth-class mail weighing at least 1 pound but not more than 10 pounds, meet the standards for all fourth-class mail, and be at least 90% advertising.’
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