CHAPTER I: POPULATION STRUCTURE
Human beings are the fundamental components of society and the essential carriers for resources and opportunities. The foundation of a country’s society is directly related to the population size and social status. Population structure refers to the proportional relationship among different properties or elements within a population in a certain geographical region during a given period of time. From a social structure perspective, population structure reflects the allocation of resources and opportunities in terms of population characteristics. Generally, a reasonable population structure suits the development of productive social forces; in essence, this is a matter of the Marxist concept of adaptation between the productive forces and the productive relations.