In 13th-century China, Kublai Khan's Yuan dynasty introduced the world's first government-backed paper currency, a bold experiment in state-controlled economics. But when this monetary innovation spread west to the Ilkhanate in Persia, it collided with gold, silver, and centuries of Islamic financial tradition. This episode unpacks the 'Great Inflation' of the 1290s, when Ilkhan Gaykhatu tried to force paper money on a reluctant populace, sparking riots, economic collapse, and the downfall of his regime. We trace the roots of this policy to Yuan minister Bolad, who carried Kublai's financial ideas across Eurasia, and examine how the resulting inflation and distrust deepened the rift between the Mongol khanates. Along the way, we meet the Persian historian Rashid al-Din, who chronicled the disaster, and the merchants of Tabriz who watched their savings evaporate overnight.