How did Ford Motor lose half its market share?

While Henry Ford may have innovated the automobile industry with assembly lines, fair wages and affordable cars, it was Gaston Chevrolet who developed the first inexpensive closed car. Ford – who had fired anyone who even suggested developing a successor to the Model T – couldn’t compete because the frame of the Model T was too weak to carry and metal roof. So Henry Ford was forced to close essentially his entire operation while developing the Model A with a closed roof. In the process, his company lost half of its over 60% share of the world’s automobile market and was never able to regain it.