During a recent German Physical Society meeting Stefan Thurner, SFI External Professor and director of complex systems research group at the Medical Univeristy of Vienna, reported that leverage--the practice by hedge funds and other investors of borrowing money to buy investments--is the root of many nettlesome properties of financial markets that classical economics cannot explain, including a propensity to crash. The model shows that many of the distinctive statistical properties of financial markets emerge together as rates of leverage climb.

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