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The Sherman Antitrust Act of 1890 and its companion, the Clayton Act of 1914, were designed not only to improve economic efficiency by reducing the market power of economic giants like the railroads and oil companies but also to prevent companies from becoming so large that their political power would undermine democracy. Trustbusters during the first decades of the twentieth century tamed American industry and arguably saved capitalism from its own excesses.
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Robert B. Reich (Beyond Outrage (Expanded Edition): What has gone wrong with our economy and our democracy, and how to fix it)