More data: in 2010, Global gdp was estimated at 65 Trillion https://www.multpl.com/world-gdp/table/by-year making the 600 Trillion - 1.2 Quadrillion number 10 - 20x leverage (large banks are required to keep 5% reserves so the math is about right on the top end). Extrapolating to 2019 GDP, I wouldn't be surprised if the derivatives market is actually (88 Trillion x 20 =) 1.76 Quadrillion
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