How did the invention of "flying cash" impact trade in China?

The invention of "flying cash," a type of paper currency used in China during the Tang and Song dynasties, significantly facilitated trade by allowing merchants to use paper money instead of heavy metal coins. This innovation made transactions much more efficient, as it eliminated the physical burden of carrying large sums of coins over long distances. With the ability to write checks or promissory notes, merchants could easily transfer funds and conduct trade without the need for heavy physical currency, which encouraged increased commercial activity and expanded the reach of the economy.

Additionally, the use of flying cash contributed to the development of a more sophisticated banking and credit system in China, which further stimulated trade and economic growth. Overall, this advancement played a crucial role in the flourishing trade networks of the time and spurred the growth of commerce throughout the region.