The link in my comment clearly shows that most of the profits are going to a small number of corporations. This is even more evidence that companies are more unstable (compared to period between WW2 and now).
From the article:
>In 2015, for example, the top 200 companies by earnings accounted for all of the profits in the stock market, according to calculations by Kathleen Kahle, a professor of finance at the University of Arizona, and Professor Stulz. In aggregate, the remaining 3,281 publicly listed companies lost money.
The employees of those 200 companies are in a good spot, but not the remaining 3,281. The consolidation due to vertical integration, automation, outsourcing are all resulting in reduced demand for labor, hence the lagging wages and instability.