naked cap: Technology Change Not the Culprit in Wages Falling Behind US Productivity Gains. February 21, 2018 by Garret Vreeland in Economics, Computing Our regressions find no significant relationship between productivity growth and changes in mean-median inequality, and very little relationship between productivity growth and changes in the labour share. In addition, as Table 1 shows, the two periods of slower productivity growth (1973-1996 and 2003-2014) were associated with faster growth in inequality (an increasing mean/median ratio and a falling labour share).Don't blame the robots.