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Economic growth requires investment in things—more machines, more basic facilities like highways or broadband—and in people, who need more and better education. Knowledge needs to be acquired and extended. Some of that extension is the product of new basic science, and some of it comes from the engineering that turns science into goods and services, and from the endless tweaking and improvement of design that, over time, turned a Model-T Ford into a Toyota Camry, or my clunky personal computer of 1983 into the sleek, almost weightless, and infinitely more powerful laptop on which I am writing this book. Investment in research and development enhances the flow of innovation, but new ideas can come from anywhere; the stock of knowledge is international, not national, and new ideas disperse quickly from the places where they are created. Innovation also needs entrepreneurs and risk-taking managers to find profitable ways of turning science and engineering into new products and services. This will be difficult without the right institutions. Innovators need to be free from the risk of expropriation, functioning law courts are needed to settle disputes and protect patents, and tax rates cannot be too high. When all of these conditions come together—as they have in the United States for a century and a half—we get sustained economic growth and higher living standards.
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