Miss. Code § 75-17-33
The Commissioner of Banking and Consumer Finance, upon any change in the discount rate on ninety-day commercial paper by the Federal Reserve bank of a Federal Reserve district of which this state is a part, shall (a) make an official announcement of the new discount rate on the same day as the change, or as soon thereafter as possible, (b) cause the dissemination of such announcement to the news media in such manner as he deems appropriate, and (c) file the same with the Commissioner of Insurance or his successor. The rate so determined shall be effective from the date of the official announcement of the new discount rate by the Commissioner of Banking and Consumer Finance. The Commissioner of Banking and Consumer Finance shall determine, on or before the twentieth day of each month, the index of market yields of the Monthly Twenty-Year Constant Maturity Index of Long-Term United States Government Bond Yields for the preceding calendar month and shall (a) make an official announcement of the index, (b) cause the dissemination of such announcement to the news media in such manner as he deems appropriate, and (c) file the same with the Commissioner of Insurance or his successor. The index so determined shall be effective on the first day of the next succeeding month.
In contracting for a finance charge pursuant to the provisions of Section 75-17-1 or Sections 75-17-21 and 75-17-23, any person shall be entitled to rely conclusively upon the most recent discount rate or index officially announced by the Commissioner of Banking and Consumer Finance. The Commissioner of Banking and Consumer Finance shall acquire, keep and maintain a separate record in which he shall note or post the maximum permissible rates of finance charges available under Section 75-17-1 and Sections 75-17-21 and 75-17-23. Each rate so determined shall be the maximum permissible rate of finance charge available under each particular section or subsection thereof, and when certified by the Commissioner of Banking and Consumer Finance shall be admissible in evidence or judicially noticed as the maximum permissible rate of finance charge under the provisions of that particular section or subsection.
Miss. Code § 75-17-33