After the invention of coins, it became easy to sell books, lessons, and instructions. The development of coins is part of the reason that both the classical world around ancient Lydia and China in the Han Dynasty were so advanced compared to other parts of the world.
但最重要的是，发明硬币大大促进了知识的传播。硬币出现后，书籍、课程和教材的销售变得更加容易。发明硬币是古吕底亚社会和中国汉朝比当时世界的其它地方先进很多的原因。