For the academic journal, see Social Development (journal).
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|Subfields and other major theories|
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Change comes from two sources. One source is random or unique factors such as climate, weather, or the presence of specific groups of people. Another source is systematic factors. For example, successful development has the same general requirements, such as a stable and flexible government, enough free and available resources, and a diverse social organization of society. On the whole, social change is usually a combination of systematic factors along with some random or unique factors.
Main article: Demographics of the world
One of the most obvious changes currently occurring is the change in the relative global population distribution between countries. In the recent decades, developing countries became a larger proportion of world population, increasing from 68% in 1950 to 82% in 2010, while population of the developed countries has declined from 32% of total world population in 1950 to 18% in 2010. China and India continue to be the largest countries, followed by the US as a distant third. However, population growth throughout the world is slowing. Population growth among developed countries has been slowing since the 1950s, and is now at 0.3% annual growth. Population growth among the less developed countries excluding the least developed has also been slowing, since 1960, and is now at 1.3% annual growth. Population growth among the least developed countries has slowed relatively little, and is the highest at 2.7% annual growth.