“Muhammad-bin-Tughlaq’s token currency scheme was an innovative economic experiment in medieval India, but its failure exposed the limitations of State control over the medieval economy.” …

The experiment. Around 1330 Muhammad-bin-Tughlaq issued a bronze and brass token coin to circulate at the value of the silver tanka. He had precedents — the paper currency of Kublai Khan's China and the abortive chao of Kaikhatu in Persia — and pressing reasons: a treasury drained by ambitious projects, and a shortage of silver in a period of global bullion scarcity.

Why it was innovative. It rested on the insight that money can derive its value from the authority of the state rather than from the metal it contains. That is the principle of representative and later fiat currency, grasped in India some three centuries before it was established in Europe.

Why it failed. Not because the idea was wrong but because the state could not enforce it. The mint was not a royal monopoly, the coins carried no security features that Indian metalworkers could not reproduce, and forgery became general — Barani's phrase is that every Hindu household turned into a mint. Foreign merchants refused the tokens. The Sultan then compounded the loss by honouring his own promise, redeeming the tokens in gold and silver at face value, so that counterfeit coin was exchanged for real bullion and heaps of worthless copper accumulated at Tughlaqabad.

What it exposes. A currency of fiat requires a monopoly of issue, a technology of authentication and public confidence, and a fourteenth-century state possessed none of the three. The episode is the clearest illustration that the limits of medieval state control lay not in the boldness of its ideas but in its administrative reach.