This is a type of simulation game that simulates aspects of economics. Many of them focus on running a business enterprise. The general focus in gameplay is on accumulating wealth and meeting customer needs. This is a sub-genre of the Simulation genre. These games are often called "tycoon" games, and in fact often have the name in their titles. There are also many city-building games, in which you must build and maintain a city and satisfy citizen's needs, while ensuring that the city's economy and infrastructures run smoothly.