### Question
How is the "investment-grade rating" defined?


### Answer
The term **investment-grade rating** is defined in *23 U.S.C. § 601* as follows -

> a rating of BBB minus, Baa3, or higher assigned by a rating agency to project obligations

#### Citation:
  - *23 U.S.C. § 601*
  - Heading: **CHAPTER 6-INFRASTRUCTURE FINANCE**

