While that's true, the capitalists where getting richer and richer even before the big economic growth. They don't really care. Also, the wage increases had to be hard fought for by a united working class. I don't see american workers unite right now to fight the rich.
The argument was that wages rise if labour is scarce. My counter is that labour will just be moved outside with the people, thus countering the scarcity, thus making wages stagnate rather than increase.
Somehow tariffs are supposed to balance this out. Which is really the nonsense in all of this.