"City Life" has a simple economy. Each building has infrastructure costs which are paid by the city to the business, including fixed costs and costs which are related to the number of employees a building requires. Roads, bridges, parks and monuments also count as buildings in this way. Buildings also have indirect costs with regards the energy they consume and waste they produce. Buildings which represent businesses also generate income which is taxed and is paid back to the city. Therefore, the monthly budget for the city (i.e. for the player) is calculated by taking the taxed income and subtracting the infrastructure costs for each building. For example, the basic industrial building has $50 of fixed infrastructure costs and generates up to $100 in revenue tax per worker. When staffed with 3 workers the net profit for the city is thus $250 per month.