sentences:  Census Bureau studies on household and individual income show lower levels than some other sources, but do not break out the highest-income households (99%+) where most change has occurred.One review describes six possible techniques for estimating American real median income growth.Estimates for the 1979-2014 period ranged from a decline of 8% (Piketty and Saez 2003) to an increase of 51% (CBO).