| Summary: | Population and economy are permanently followed by the manifestation of unbalances both in quantity and inquality. For population, the demographic evolution is determined by its natural movement, at world level, which is aresult of natality and mortality, and also by migration, locally. Balance is an ideal status. It would be utopian, though,to consider that a balance could be reached, even for a short period of time. Essentially, the most efficient actions thatcan be done are preventing some demographic unbalances and removing their effects. In order to accomplish this it isimportant to analyze the causes and effects of every phenomenon that affects the demographic unbalance, and toestablish how to diminish it. These issues are very complex as some elements of influence are both causes and effectsof the unbalances. However, people have proved that they are able to respond to these dangers, by continuouslyadapting to the environment. The demographic phenomena are influenced by a multitude of factors, especially thenatural, social, historical, economical ones. Within these factors, the existence of resources and the way to implementthem significantly enrich the demographic evolution, as the population dimension depends on economy.
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