that Standard Oil was not a monopoly, and argue that the intense free market competition resulted in cheaper oil prices and more diverse petroleum products. Critics claimed that success in meeting consumer needs was driving other companies, who were not as successful, out of the market. An example of this thinking was given in 1890, when Rep. William Mason, arguing in favor of the Sherman Antitrust Act, said: "trusts have made products cheaper, have reduced prices; but if the price of oil, for instance, were reduced to one cent a barrel, it would not right the wrong done to people of this country by the trusts which have destroyed legitimate competition and driven honest men from legitimate business enterprise". The Sherman Antitrust Act prohibits the restraint of trade. Defenders of Standard Oil insist that the company did not restrain trade; they were simply superior competitors. The federal courts ruled otherwise. Some economic historians have observed that Standard Oil was in the process of losing its monopoly at the time of its breakup in 1911. Although Standard had 90 percent of American refining capacity in 1880, by 1911, that had shrunk to between 60 and 65 percent because of the expansion in capacity by competitors. Numerous regional competitors (such as Pure Oil in the East, Texaco and Gulf Oil in the Gulf Coast, Cities Service and Sun in the Midcontinent, Union in California, and Shell overseas) had organized themselves into competitive vertically integrated oil companies, the industry structure pioneered years earlier by Standard itself. In addition, demand for petroleum products was increasing more rapidly than the ability of Standard to expand. The result was that although in 1911 Standard still controlled most production in the older regions of the Appalachian Basin (78 percent share, down from 92 percent in 1880), Lima-Indiana (90 percent, down from 95 percent in 1906), and the Illinois Basin (83 percent, down from 100 percent in 1906), its share was much lower in the rapidly expanding new regions that would dominate U.S. oil production in the 20th century. In 1911, Standard controlled only 44 percent of production in the Midcontinent, 29 percent in California, and 10 percent on the Gulf Coast. Some analysts argue that the breakup was beneficial to consumers in the long run, and no one has ever proposed that Standard Oil be reassembled in pre-1911 form. ExxonMobil, however, does represent a substantial part of