This is a rhetorical question of course, for the lack of wage growth is to be found in the vast amount of money chasing a global labor pool.
It is capital that had benefited from the last 30 years of the unleashing workers after the fall of the Soviet Empire and the black/white cat policies of Deng in pursuing growth in China. Now that other emerging economies are attracting capital in an effort to create jobs, there still remains a great deal of downward pressure on wages. Even the movement of supply chains out of China will act as a drag on global earnings as manufacturers will act to hold down wages as way of remaining attractive to foreign direct investment. The world has been watching as Chinese earnings growth has accelerated over the last 10 years but one of the outcomes from the Trump tariffs will be to force a slowdown in China’s wage inflation.