Investors in London and Paris poured money into the railroads through the American financial market centered in Wall Street. By 1900, the process of economic concentration had extended into most branches of industry—a few large corporations, called "trusts", dominated in steel, oil, sugar, meat, and farm machinery. Through vertical integration these trusts were able to control each aspect of the production of a specific good, ensuring that the profits made on the finished product were maximized and prices minimized, and by controlling access to the raw materials, prevented other companies from being able to compete in the marketplace. Several monopolies—most famously Standard Oil—came to dominate their markets by keeping prices low when competitors appeared; they grew at a rate four times faster than that of the competitive sectors.