structural:summarization, linguistic:voice_change
First paper money

The world's first paper money (" flying money ") was invented by the Chinese and they needed some commodity to back it. Traditional coins were useful, but the amount of coins needed for large purchases could be bulky and dangerous to transport. That problem was solved when the Chinese created small pieces of paper with pictures of the coin printed on them. By the nature of their geography, China had no real amount of precious metals of their own to back the paper money they invented. Because the Spaniards did not find gold but did find copious amounts of silver in Bolivia and Mexico, the Spaniards and the rest of Europe used this silver to purchase the commodities of choice from China, solving both of their problems.