What was Liu Huaqiang's source of income in the TV series Conquer?

In the TV series Conquer, Liu Huaqiang's source of income was to monopolize local energy and resources. By mastering the local energy and resources, Liu Huaqiang became the local overlord and obtained rich economic benefits. In addition, Liu Huaqiang also gained huge financial benefits by controlling the local financial industry. In the end, Liu Huaqiang became a huge economic empire that monopolized almost all local resources and industries.