1, increasing revenue and reducing expenditure is an idiom in China, which means developing water sources and controlling water flow. Metaphor to increase revenue and reduce expenditure.

2. Idiom story: Xun Kuang, a thinker in the Warring States Period, expounded the strategy of enriching the country in Rich Country. If a country wants to be rich and strong, it must care about the people and increase revenue and expenditure. Only when the people live and work in peace and contentment and develop production can the country become rich and strong. If we neglect production and waste materials, the people will be poor. So "poor is poor, rich is rich."