In recent years, governments and international organizations have been discussing solutions to this problem. Several important questions have been asked. Can the poor shelters of unplanned settlements be changed into safe, comfortable homes ? Can city authorities plan areas for settlement with water supplies and sewerage systems where people could build their own homes ? The homes might still be very poor but the area would be healthier. Should authorities try to build inexpensive public housing ? Or perhaps the best solution is a political one. Governments should make sure that economic development is distributed evenly throughout a country so that there are not such large populations in a few cities.