Because I can see his point
Productivity growth has frequently been labeled the source of our ability to raise living standards. This is sometimes what is meant by the call to improve our “competitiveness.” In fact, higher productivity is an important goal, but it only establishes the potential for higher living standards, as the experience of the last 30 or more years has shown. Productivity in the economy grew by 80.4 percent between 1973 and 2011 but the growth of real hourly compensation of the median worker grew by far less, just 10.7 percent, and nearly all of that growth occurred in a short window in the late 1990's.
The wedges between productivity and median compensation growth