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David Orrell is a writer and mathematician. His research on complex systems has been featured in the Financial Times, BBC radio and New Scientist, and his writing on science and economics has been published in World Finance, Bitcoin Magazine and Newsweek Japan, among others. His latest books are The Money Formula (2017), co-written with Paul Wilmott; and a revised and extended 2017 version of Economyths, with a new chapter on quantum money. Quantum Economics will be published by Icon in summer 2018. He lives in Toronto.