Transport infrastructure also mattered for Chinese economic development. Economic growth in the Middle Kingdom was greatly aided by the creation of the Grand Canal by the Sui (581–618 CE) and Tang (618–907 CE) dynasties and improved by their successors. The Grand Canal, said to be 40 meters wide, connected the Yangzi to the Yellow River. Its construction needed thousands of laborers and the vast expenditures involved caused the collapse of the Sui. The canal transported grain to the capital city, Luoyang, and played a critical role in supplying the army guarding the northern frontier. In the Tang dynasty, 130,000 tons of grain were transported north each year (Ball, 2017, p. 120).

How the world became rich