Big picture:

the $5 day was a solution to extremely high worker turnover
it was understood as a form of profit sharing but was threatening to other industries
once workers got used to the new system, they began to complain
complaints about monotony and speedup then built up again in the late 1920s

two issues:
unemployment rate and use of the
            term technological unemployment
technological unemployment:

a new level of mass production meant many jobs of all sorts were being replaced by machines
Ford had to speed up the assembly line to compete because the company had high fixed costs
workers developed the technique of a sit down strike, occupying the factory
won the right to unionize

Diego Rivera murals
Johnny Cash, One Piece at a Time