On the one hand, the problems of moving to cities often outweigh the benefits. Firstly, when the population of an area increases, the price of essential goods such as housing and food rises sharply. Secondly, car usage is increasing, and if governments had not invested in road infrastructure in the past, traffic congestion and air pollution would have been far worse. Thirdly, after migrating to cities, rural areas face a shortage of workforce. For example, when doctors move to urban centers to seek a better life, people in rural communities must travel long distances to cities when they become sick.