The biggest mistake committed by Muhammad Tughluq was the introduction of token currency. Muhammad bin Tughlaq is crticised for his failed experiment with the token currency. The scarcity of silver and abundance of copper and bronze metal prompted the sultan to issue copper coins bearing same value as that of silver coins. However, the new copper coins bearing the same value as the silver coin did not had any complicated design on it and could be easily forged. People started minting coins in their houses. The forged copper coins flooded the markets. Situation became worse when the traders and merchants refused to accept these coins. Economy came to a stand still. Realising his folly, Muhammad bin Tughlaq issued genuine silver coins on the place of copper coins. This further drained the royal treasury.