The fact that there were new industries created new ways of managing industries. For example, new products such as telephones, radios, vacuum cleaners, washing machines, and others were being made on a large scale, but at a cheaper price. Very good advertising was also created for many products. The largest new industry in the 1920s was the motorcar industry. It had been made entirely different by Henry Ford. By the year 1929, 4.8 million cars had been made.