When was cash invented?

Cash, in the form of coins, was first introduced around 600 BC in Lydia, an ancient kingdom in what is now Turkey. These coins were made of electrum, a naturally occurring alloy of gold and silver. Paper money later emerged in China during the Tang Dynasty (618-907 AD), gaining prominence in the Song Dynasty (960-1279 AD). This evolution marked significant milestones in the development of cash as a medium of exchange.