Agrarian society was preceded by
hunters and gatherers and
horticultural societies and transitioned into
industrial society. The transition to agriculture, called the
Neolithic Revolution, has taken place independently multiple times. Horticulture and agriculture as types of subsistence developed among humans somewhere between 10,000 and 8,000 years ago in the
Fertile Crescent region of the
Middle East. The reasons for the development of agriculture are debated but may have included
climate change, and the accumulation of food surplus for competitive
gift-giving. Most certainly there was a gradual transition from hunter-gatherer to agricultural economies after a lengthy period when some crops were deliberately planted and other foods were gathered from the wild. An example of this transition can be found in the cultivation of
wild cereals by hunter-gatherers in the Central Sahara. Between 7500 BCE and 3500 BCE, undomesticated central Saharan flora were
farmed, stored, and
cooked, while
domesticated animals (e.g.,
Barbary sheep) were
milked and managed, by hunter-gatherers near the Takarkori rockshelter, which is representative of the broader Sahara; this continued until the beginning of the
Pastoral Neolithic in the Sahara. In addition to the emergence of farming in the Fertile Crescent, agriculture appeared: by at least 6,800 BCE in
East Asia (
rice) and, later, in Central and South America (
maize and
squash).
Small-scale agriculture also likely arose independently in early Neolithic contexts in India (rice) and Southeast Asia (
taro). However, full dependency on domestic crops and animals, when wild resources contributed a nutritionally insignificant component to the diet, did not occur until the
Bronze Age. Agriculture allows a much greater
density of population than can be supported by hunting and gathering and allows for the accumulation of excess product to keep for winter use or to sell for profit. The ability of farmers to feed large numbers of people whose activities have nothing to do with material production was the crucial factor in the rise of surplus, specialization, advanced technology,
hierarchical social structures, inequality, and standing armies. Agrarian societies thus support the emergence of a more complex
social structure. In agrarian societies, some of the simple correlations between
social complexity and environment begin to disappear. One view is that humans with this technology have moved a large step toward controlling their environments, are less dependent on them, and hence show fewer correlations between environment and technology-related traits. A rather different view is that as societies become larger and the movement of goods and people cheaper, they incorporate an increasing range of environmental variation within their borders and trade system. But environmental factors may still play a strong role as variables that affect the internal structure and history of a society in complex ways. For example, the average size of agrarian states will depend on the ease of transportation, major cities will tend to be located at trade nodes, and the demographic history of a society may depend on disease episodes. Until recent decades, the transition to farming was seen as an inherently progressive one: people learnt that planting seeds caused crops to grow, and this new improved food source led to larger populations, sedentary farm and town life, more leisure time and so to specialization, writing, technological advances and
civilization. It is now clear that agriculture was adopted despite certain disadvantages of that lifestyle. Archeological studies show that health deteriorated in populations that adopted
cereal agriculture, returning to pre-agricultural levels only in modern times. This is in part attributable to the spread of
infection in crowded cities, but is largely due to a decline in dietary quality that accompanied intensive cereal farming. People in many parts of the world remained hunter-gatherers until quite recently; though they were quite aware of the existence and methods of agriculture, they declined to undertake it. Many explanations have been offered, usually centered around a particular factor that forced the adoption of agriculture, such as environmental or
population pressure. Main source of income was cultivation and farming. == In the modern world ==