Consider the period from 1980 to 2011. Cash income per member of a median income household, which includes items like wages and interest and cash payments from government like Social Security, only grew by about $4,300 or 27 percent over that period, when adjusted for inflation. From 2000 to 2010, it was even negative. Yet according to data from the Bureau of Economic Analysis, per capita personal income—our most comprehensive measure of individual income—grew 72 percent from 1980 to 2011.