Both reasons are in fact correct, but only one person here is accusing the other of being wrong and spreading lies. Please be more circumspect in your language.
https://www.saturdayeveningpost.com/2014/01/ford-doubles-min...
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. It’s 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. One’s own employees ought to be one’s own best customers.”