The industry type a city should support and encourage is decided by the parliament. It also provides the company with economy tax exemptions and reductions policy. In order to gain the city parliament's policy support, different branches of industries need to invest the city. This can improve the industries' influence on its city. The highly influenced industry will enjoy 20% tax exemptions on products' sales tax. The city's development will rise in different degrees through investment, according to the investment gross amount. The higher the city's development is, the more amount of sale out products will get in 30 minutes.