Theories of social change, both old and new, commonly assume that the course of social change is not arbitrary but is, to a certain degree, regular or patterned. The three traditional ideas of social change—decline, cyclic change, and progress—have unquestionably influenced modern theories. Yet because these theories are not scientifically determined, they fail to make an explicit distinction between decline and progress. In fact, the qualities of decline and progress cannot be derived scientifically (that is, from empirical observations) alone but are instead identified by normative evaluations and value judgments. If the study of social change is to be conducted on a scientific and nonnormative basis, then, only two fundamental patterns of social change can be considered: the cyclic, as identified above, and the one-directional. Often the time span of the change determines which pattern is observed.

Cyclic change

Much of ordinary social life is organized in cyclic changes: those of the day, the week, and the year. These short-term cyclic changes may be regarded as conditions necessary for structural stability. Other changes that have a more or less cyclic pattern are less predictable. One example is the business cycle, a recurrent phenomenon of capitalism, which seems somewhat patterned yet is hard to predict. A prominent theory of the business cycle is that of the Russian economist Nikolay D. Kondratyev, who tried to show the recurrence of long waves of economic boom and recession on an international scale. He charted the waves from the end of the 18th century, with each complete wave comprising a period of about 50 years. Subsequent research has shown, however, that the patterns in different countries have been far from identical.

Long-term cyclic changes are addressed in theories on the birth, growth, flourishing, decline, and death of civilizations. Toynbee conceived world history in this way in the first volumes of A Study of History (1934–61), as did Spengler in his Decline of the West (1918–22). These theories have been criticized for conceiving of civilizations as natural entities with sharp boundaries, thinking that neglects the interrelations between civilizations.

One-directional change

This type of change continues more or less in the same direction. Such change is usually cumulative and implies growth or increase, such as that of population density, the size of organizations, or the level of production. The direction of the change could, however, be one of decrease or a combination of growth and decrease. An example of this last process is what the American cultural anthropologist Clifford Geertz called “involution,” found in some agrarian societies when population growth is coupled with a decrease in per capita wealth. Yet another change may be a shift from one pole to the other of a continuum—from religious to secular ways of thinking, for example. Such a change may be defined as either growth (of scientific knowledge) or decline (of religion).

The simplest type of one-directional change is linear, occurring when the degree of social change is constant over time. Another type of social change is that of exponential growth, in which the percentage of growth is constant over time and the change accelerates correspondingly. Population growth and production growth are known to follow this pattern over certain time frames.

A pattern of long-term growth may also conform to a three-stage S curve. In the first phase the change is slow enough as to be almost imperceptible. Next the change accelerates. In the third phase the rate of change slackens until it approaches a supposed upper limit. The model of the demographic transition in industrializing countries exhibits this pattern. In the first (premodern or preindustrial) stage both the birth rate and the mortality rate are high, and, consequently, the population grows very slowly; then mortality decreases, and the population grows much faster; in the third stage both the birth rate and the mortality rate have become low, and population growth approaches zero. The same model has been suggested, more hypothetically, for the rates of technological and scientific change.

Combined patterns of change

Cyclic and one-directional changes may be observed simultaneously. This occurs in part because short-term change tends to be cyclic while long-term change tends to follow one direction. For example, production rates of industrializing countries exhibit the pattern of short-term business cycles occurring within long-term economic development.

These patterns cannot be applied simply and easily to social reality. At best, they are approximations of social reality. Comparing the model with reality is not always possible, because reliable data are not always available. Moreover, and more important, many social processes do not lend themselves to precise quantitative measurement. Processes such as bureaucratization or secularization, for example, can be defined through changes in a certain direction, but it is hard to reach agreement on the dimensions to be measured.

It remains to be seen whether long-term social change in a certain direction will be maintained. The transformation of medieval society into the modern nations of the West may be conceived in terms of several interconnected long-term one-directional changes. Some of the more important of these changes include commercialization, increasing division of labour, growth of production, formation of nation-states, bureaucratization, growth of technology and science, secularization, urbanization, spread of literacy, increasing geographic and social mobility, and growth of organizations. Many of these changes have also occurred in non-Western societies. Most changes did not originate in the West, but some important changes did, such as the Industrial Revolution and the rise of capitalism. These changes subsequently had a strong impact on non-Western societies. Additionally, groups of people outside western Europe were drawn into a global division of labour, with Western nation-states gaining dominance both politically and economically.

The extent to which these changes are part of a global long-term social development is the central question of social evolution. Although knowledge concerning this question is far from complete, some general trends may be hypothesized. One trend is seen in the technological innovations and advances in scientific knowledge that have harnessed natural forces for the satisfaction of human needs. Among these innovations were the use of fire, the cultivation of plants, the domestication of animals (dating from about 8000 bce), the use of metals, and the process of industrialization. These long-term developments, combined with long-term capital accumulation, led to rising production and paved the way for population growth and increasing population density. Energy production and consumption grew, if not per capita, then at least per square mile.

Another trend stems from production methods based on the division of labour and social differentiation. The control of natural forces, and the ensuing social progress, was achieved only by utilizing the division of labour—and the corresponding specialization of knowledge—to raise productivity beyond natural limits. One consequence of this growth of productivity and technological innovation, however, was social differentiation. More people, in other words, could specialize in activities that were not immediately necessary for survival. Growth in the size and density of populations and increases in social differentiation heightened the interdependence of more and more people over longer distances. In hunting-and-gathering societies people were strongly interdependent within their small bands, depending on very little from outside their groups. In modern times most of the world’s people are linked by networks of interdependence that span the globe.

These processes are not inevitable in the sense that they correspond to any “law” of social change. They have had the tendency, however, to spread whenever they occurred. For example, once the set of transformations known as the agrarian revolution had taken place anywhere in the world, their extension over the rest of the world was predictable. Societies that adopted these innovations grew in size and became more powerful. As a consequence, other societies had only three options: to be conquered and incorporated by a more powerful agrarian society, to adopt the innovations, or to be driven to marginal places of the globe. Something similar might be said of the Industrial Revolution and other power-enhancing innovations, such as bureaucratization and the introduction of more destructive weapons. The example of weapons illustrates that these transformational processes should not be equated with progress in general.

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Explanations of social change

One way of explaining social change is to show causal connections between two or more processes. This may take the form of determinism or reductionism, both of which tend to explain social change by reducing it to one supposed autonomous and all-determining causal process. A more cautious assumption is that one process has relative causal priority, without implying that this process is completely autonomous and all-determining. What follows are some of the processes thought to contribute to social change.

Natural environment

Changes in the natural environment may result from climatic variations, natural disasters, or the spread of disease. For example, both the worsening of climatic conditions and the Black Death epidemics are thought to have contributed to the crisis of feudalism in 14th-century Europe. Changes in the natural environment may be either independent of human activities or caused by them. Deforestation, erosion, air pollution, and contemporary climate change belong to the latter category, and they in turn may have far-reaching social consequences.

Demographic processes

Population growth and increasing population density represent demographic forms of social change. Population growth may lead to geographic expansion of a society, military conflicts, and the intermingling of cultures. Increasing population density may stimulate technological innovations, which in turn may increase the division of labour, social differentiation, commercialization, and urbanization. This sort of process occurred in western Europe from the 11th to the 13th century and in England in the 18th century, where population growth spurred the Industrial Revolution. On the other hand, population growth may contribute to economic stagnation and increasing poverty, as may be witnessed in several developing countries today.

Technological innovations

Several theories of social evolution identify technological innovations as the most important determinants of societal change. Such technological breakthroughs as the smelting of iron, the introduction of the plow in agriculture, the invention of the steam engine, and the development of computers and the Internet have had lasting social consequences.

Economic processes

Technological changes are often considered in conjunction with economic processes. These include the formation and extension of markets, modifications of property relations (such as the change from feudal lord-peasant relations to contractual proprietor-tenant relations), and changes in the organization of labour (such as the change from independent craftsmen to factories). Historical materialism, as developed by Marx and Engels, is one of the more prominent theories that gives priority to economic processes, but it is not the only one. Indeed, materialist theories have even been developed in opposition to Marxism. One of these theories, the “logic of industrialization” thesis by the American scholar Clark Kerr and his colleagues, states that industrialization everywhere, including in the mid-20th-century communist countries, has similar consequences.

Ideas

Other theories have stressed the significance of ideas as causes of social change. Comte’s law of three stages is such a theory. Weber regarded religious ideas as important contributors to economic development or stagnation; according to his controversial thesis, the individualistic ethic of Christianity, and in particular Calvinism, partially explains the rise of the capitalist spirit, which led to economic dynamism in the West.

Social movements

A change in collective ideas is not merely an intellectual process; it is often connected to the formation of new social movements. This in itself might be regarded as a potential cause of social change. Weber called attention to this factor in conjunction with his concept of “charismatic leadership.” Charismatic leaders, by virtue of the extraordinary personal qualities attributed to them, are able to create a group of followers who are willing to break established rules. Examples include Jesus, Napoleon, and Hitler. In later social theory, however, the concept of charisma was trivialized to refer to almost any popular figure.

Political processes

Changes in the regulation of violence, in the organization of the state, and in international relations may also contribute to social change. For example, German sociologist Norbert Elias interpreted the formation of states in western Europe as a relatively autonomous process that led to increasing control of violence and, ultimately, to rising standards of self-control. According to other theories of political revolution, such as those proposed by the American historical sociologist Charles Tilly, the functioning of the state apparatus itself and the nature of interstate relations are of decisive importance in the outbreak of a revolution: it is only when the state is not able to fulfill its basic functions of maintaining law and order and defending territorial integrity that revolutionary groups have any chance of success.

Each of these processes may contribute to others; none is the sole determinant of social change. One reason why deterministic or reductionist theories are often disproved is that the method for explaining the processes is not autonomous but must itself be explained. Moreover, social processes are often so intertwined that it would be misleading to consider them separately. For example, there are no fixed borders between economic and political processes, nor are there fixed boundaries between economic and technological processes. Technological change may in itself be regarded as a specific type of organizational or conceptual change. The causal connections between distinguishable social processes are a matter of degree and vary over time.