> Musa's generous actions inadvertently devastated the economies of the regions through which he passed. In the cities of Cairo, Medina, and Mecca, the sudden influx of gold devalued the metal for the next decade. Prices on goods and wares greatly inflated. To rectify the gold market, on his way back from Mecca, Musa borrowed all the gold he could carry from money-lenders in Cairo, at high interest. This is the only time recorded in history that one man directly controlled the price of gold in the Mediterranean.
> Musa's generous actions inadvertently devastated the economies of the regions through which he passed. In the cities of Cairo, Medina, and Mecca, the sudden influx of gold devalued the metal for the next decade. Prices on goods and wares greatly inflated. To rectify the gold market, on his way back from Mecca, Musa borrowed all the gold he could carry from money-lenders in Cairo, at high interest. This is the only time recorded in history that one man directly controlled the price of gold in the Mediterranean.
https://en.wikipedia.org/wiki/Musa_I_of_Mali