The population management process is not dependent on size or population density, but on a valid population with sustainable resources, on resource use measures and on the distribution of quantities. that use. If for a environment with 10 people, but only have enough water and food for 9, when he in a secret of which is not have a Quan of trade, that environment is overpopulated; If the population is 100 but there is enough food, shelter and water for 200 people for an unlimited future, then it is not overpopulation. The demographic process may arise from an increase in fertility, a decline in medical development, an increase in immigration, or from an irreversible and exhausted biome. Highly sparsely populated areas can also experience contentious victims, when the area may have low or no capacity to sustain the lives of the living (e.g., the central Sahara Desert or Antarctic) .