$3.5 billion Oklahoma Policy Institute // February 17, 2020 // Updated: February 17, 2020 Number of the Day The economic impact of Oklahoma state retirement system benefits. [Source: National Institute for Retiree Security] See previous Numbers of the Day here. Share This:FacebookTwitterLinkedInTumblrRedditPocketEmailPrint ABOUT THE AUTHOR Oklahoma Policy Institute // @okpolicy // digital@okpolicy.org Oklahoma Policy Insititute (OK Policy) advances equitable and fiscally responsible policies that expand opportunity for all Oklahomans through non-partisan research, analysis, and advocacy.