To produce the rivers of credit necessary to fund the Edisons, the Westinghouses and the Fords of early-twentieth-century capitalism, small banks merged to form large ones and lent either to the industrialists directly or to speculators eager to buy shares in the new corporations. That’s how electromagnetism transformed capitalism: while its grids would go on to power mega-firms and its megawatts translated into mega-profits, it also created the first mega-debts in the form of vast overdraft facilities for the Edisons, the Westinghouses and the Fords. And it led to the emergence of Big
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