### Question
How is the "regular-rate category" defined?


### Answer
The term **regular-rate category** is defined in *39 U.S.C. § 3626* as follows -

> any class of mail or kind of mailer, other than a class or kind referred to in section 2401(c)

#### Citation:
  - *39 U.S.C. § 3626*
  - Heading: **PART IV-MAIL MATTER > CHAPTER 36-POSTAL RATES, CLASSES, AND SERVICES > SUBCHAPTER I-PROVISIONS RELATING TO MARKET-DOMINANT PRODUCTS**

