Henry Ford was largely responsible for the popularization of the 40 hour work week and paid his factory employees nearly double of what they would ordinarily get.
1926: Henry Ford popularized the 40-hour work week after he discovered through his research that working more yielded only a small increase in productivity that lasted a short period of time. Ford announced he would pay each worker $5 per eight-hour day, which was nearly double what the average auto worker was making that time. Manufacturers and companies soon followed Henry Ford’s lead after seeing how this new policy boosted productivity and fostered loyalty and pride among Ford’s employees.
Of course, this is a rarity. Most employee concessions in the US were earned with blood.
https://en.wikipedia.org/wiki/Homestead_strike