Rosser's equation
In economics, Rosser's equation (named after J. Barkley Rosser, Jr.) calculates future US Social Security Administration Trust Fund balances and payments as the ratio of benefit payments in real terms for a given income level to be received the year after the Trust Fund would be exhausted, to those of the same income level for an initial year. Equation. ("FRA"("T")/"FRA"("t"))·100 where: Usage. Rosser's equation was used in Rosser (2005) to make calculations based on given reports and projections. The label was coined by Bruce Webb in 2010, picked up by others, with Webb declaring it  as "something between an inside joke and a tribute to Prof. Barkley Rosser, Jr. of James Madison University, an economist friend of mine who pointed out a surprising result: real payable benefits after projected Trust Fund depletion and subsequent 25% cut will still be higher in actual basket of goods terms than those of current retirees,". The most important inputs to the equation are the projections from the SSA Trust Fund reports, which depend on demographic and economic assumptions.