'Parents' wealth and parents' level of education.
Demographics and the General Population
Large families have typically been preferred by humans throughout history—often to ensure the survival of a specific family line or ethnic group. The need to have as many children as possible resulted from the high mortality rates brought on by battles, predators, and epidemics. The situation, however, has drastically changed over the past century as a result of technological advancements of many kinds that have led to a worldwide "population boom," with the globe presently adding 90 million people annually (most of this increase in poorer countries). By 2020, there will be 8 billion people on the planet, exceeding 6 billion in the early 2000s. It makes sense that sociologists from all across the world are gravely concerned about population growth.
Demography is the study of human populations; the word comes from the Greek and means "description of people." The field looks at how many people there are, what they look like, and how they travel around from place to place. Demographers also examine how to manage and mitigate population growth's consequences.
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