In 1923, DuPont was granted the exclusive right to make and sell cellophane in North America. In 1927, the company introduced a moisture-proof brand of cellophane that was ideal for various wrapping needs. Although more expensive than most competing wrapping, it offered a desired combination of transparency, strength, and cost. Except for its permeability to gases, however, cellophane had no qualities that a number of competing materials did not possess as well. Cellophane sales increased dramatically, and by 1950, DuPont produced almost 75 percent of the cellophane sold in the United States. Nevertheless, sales of the material constituted less than 20 percent of the sales of ‘‘flexible packaging materials.’’
The United States brought an action, contending that by so dominating cellophane production, DuPont had monopolized a part of trade or commerce in violation of the Sherman Act. DuPont argued that it had not monopolized because it did not have the power to control the price of cellophane or to exclude competitors from the market for flexible wrapping materials. Who is correct? Explain.