Overcrowding is a happiness problem with which every large city will eventually have to deal. Once a city reaches a certain critical size (dependent on the difficulty level of the game) each additional population will result in a loss of one happiness. The overcrowding can be combated by building improvements which ease overcrowding such as the Aqueduct, or by hiring entertainers and building a variety of city improvements to distract the people from their miserably overcrowded lives. The size limit before a city experiences overcrowding is population 3.