Leverage is an awesome concept—a civilization-altering concept. In fact, without leverage, you wouldn’t be holding this book right now! Let me explain. In 1440, a young German entrepreneur named Johannes Gutenberg converted a wine press into the world’s first commercial printing press. He printed 180 copies of the Gutenberg Bible and sold them all within a few days. Gutenberg’s printing press was an immediate success. Within decades, printing presses had sprung up all over Europe. By the mid-1600s, there were eight million printed books circulating in Europe, which was 10 times the number of
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