In the long run, due to the desire to keep costs low, it was advantageous for firms to merge and reduce their transportation costs thus producing and transporting from one location rather than various sites of different companies as in the past. This resulted in shipment directly to market from this one location. In addition, technological changes prior to the merger movement within companies increased the efficient size of plants with capital intensive assembly lines allowing for economies of scale. Thus improved technology and transportation were forerunners to the Great Merger Movement. In part due to competitors as mentioned above, and in part due to the government, however, many of these initially successful mergers were eventually dismantled. The U.S. government passed the Sherman Act in 1890, setting rules against price fixing and monopolies. Starting in the 1890s with such cases as U.S. versus Addyston Pipe and Steel Co., the courts attacked large companies for strategizing with others or within their own companies to maximize profits. Price fixing with competitors created a greater incentive for companies to unite and merge under one name so that they were not competitors anymore and technically not price fixing.