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Yet just eighty years ago it still seemed an impossible mission when U.S. President Herbert Hoover was tasked with beating back the Great Depression with only a mixed bag of numbers, ranging from share values to the price of iron to the volume of road transport. Even his most important metric – the “blast-furnace index” – was little more than an unwieldy construct that attempted to pin down production levels in the steel industry. If you had asked Hoover how “the economy” was doing, he would have given you a puzzled look. Not only because this wasn’t among the numbers in his bag, but because he would have had no notion of our modern understanding of the word “economy.” “Economy” isn’t really a thing, after all – it’s an idea, and that idea had yet to be invented. In 1931, Congress called together the country’s leading statisticians and found them unable to answer even the most basic questions about the state of the nation. That something was fundamentally wrong seemed evident, but their last reliable figures dated from 1929. It was obvious that the homeless population was growing and that companies were going bankrupt left and right, but as to the actual extent of the problem, nobody knew. A few months earlier, President Hoover had dispatched a number of Commerce Department employees around the country to report on the situation. They returned with mainly anecdotal evidence that aligned with Hoover’s own belief that economic recovery was just around the bend. Congress wasn’t reassured, however. In 1932, it appointed a brilliant young Russian professor by the name of Simon Kuznets to answer a simple question: How much stuff can we make? Over the next few years, Kuznets laid the foundations of what would later become the GDP. His
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