"To accommodate for lack of dependable rainfall" would be the best option as to why the ancient Chinese organized large groups of people to build and maintain irrigation systems, since when rainfall would not come for long periods of time, the crops would likely die without proper irrigation.
Reduce marginal tax rates on income from labor and capital.
Reduce regulation.
Tighten the money supply to reduce inflation.
Reduce the growth of government spending.
They always told them to not
Ramadan is your answer your welcome e