Henry Ford family sole ownership of the company. By the mid-1920s, sales of the Model T began to decline due to rising competition. Other auto makers offered payment plans through which consumers could buy their cars, which usually included more modern mechanical features and styling not available with the Model T. Despite urgings from Edsel, Henry refused to incorporate new features into the Model T or to form a customer credit plan. By 1926, flagging sales of the Model T finally convinced Ford to make a new model. He pursued the project with a great deal of technical expertise in design of
Ford Model T flexible mass production. As a result, Ford's cars came off the line in three-minute intervals, much faster than previous methods, reducing production time from 12.5 hours before to 93 minutes by 1914, while using less manpower. In 1914, Ford produced more cars than all other automakers combined. The Model T was a great commercial success, and by the time Henry made his 10 millionth car, half of all cars in the world were Fords. It was so successful Ford did not purchase any advertising between 1917 and 1923; instead, the Model T became so famous, people considered it a norm.