Higher wages were necessary, Ford realized, to retain workers who could handle the pressure and the monotony of his assembly line. In January of 1914, his continuous-motion system reduced the time to build a car from 12 and a half hours to 93 minutes. But the pace and repetitiveness of the jobs was so demanding, many workers found themselves unable to withstand it for eight hours a day, no matter how much they were paid.
But Ford had an even bigger reason for raising his wages, which he noted in a 1926 book, Today and Tomorrow. Its as a challenging a statement today as it as 100 years ago. The owner, the employees, and the buying public are all one and the same, and unless an industry can so manage itself as to keep wages high and prices low it destroys itself, for otherwise it limits the number of its customers. Ones own employees ought to be ones own best customers.
It might have been just another of Fords wild ideas, except that it proved successful. In 1914, the company sold 308,000 of its Model Tsmore than all other carmakers combined. By 1915, sales had climbed to 501,000. By 1920, Ford was selling a million cars a year.
We increased the buying power of our own people, and they increased the buying power of other people, and so on and on, Ford wrote. It is this thought of enlarging buying power by paying high wages and selling at low prices that is behind the prosperity of this country.
http://www.saturdayeveningpost.com/2014/01/03/history/post-perspective/ford-doubles-minimum-wage.html