This includes the Four Great Inventions: papermaking, the compass, gunpowder, and printing (both woodblock & movable type)
Other well-known achievements is the creation of the Great Wall and a large army of Terracotta Warriors.
square sail I'm not 100% sure on that
The answer to your question is the first one.
When people trade securties at a low transcation cost
They wanted to improve schools, health system and better the living conditions. They wanted to introduce social laws who would help children and workers. They wanted to stop the big companies from abusing workers and make government more responsive to peoples needs.
