Economics is the social science that studies the production, distribution, and consumption of goods and services. The term economics comes from the Ancient Greek ? (oikonomia, “management of a household, administration”) from ? (oikos, “house”) + ? (nomos, “custom” or “law”), hence “rules of the house(hold)”. Current economic models developed out of the broader field of political economy in the late 19th century, owing to a desire to use an empirical approach more akin to the physical sciences.

A definition that captures much of modern economics is that of Lionel Robbins in a 1932 essay: “the science which studies human behaviour as a relationship between ends and scarce means which have alternative uses.” Scarcity means that available resources are insufficient to satisfy all wants and needs. Absent scarcity and alternative uses of available resources, there is no economic problem. The subject thus defined involves the study of choices as they are affected by incentives and resources.

Economics aims to explain how economies work and how economic agents interact. Economic analysis is applied throughout society, in business, finance and government, but also in crime, education, the family, health, law, politics, religion, social institutions, war,[7] and science. The expanding domain of economics in the social sciences has been described as economic imperialism.

Common distinctions are drawn between various dimensions of economics: between positive economics (describing “what is”) and normative economics (advocating “what ought to be”) or between economic theory and applied economics or between mainstream economics (more “orthodox” dealing with the “rationality-individualism-equilibrium nexus”) and heterodox economics (more “radical” dealing with the “institutions-history-social structure nexus”). However the primary textbook distinction is between microeconomics (”small” economics), which examines the economic behavior of agents (including individuals and firms) and macroeconomics (”big” economics), addressing issues of unemployment, inflation, monetary and fiscal policy for an entire economy.

History of economic thought.

The city states of Sumer developed a trade and market economy based originally on the commodity money of the Shekel which was a certain weight measure of barley, while the Babylonians and their city state neighbors later developed the earliest system of economics using a metric of various commodities, that was fixed in a legal code. The early law codes from Sumer could be considered the first (written) economic formula, and had many attributes still in use in the current price system today… such as codified amounts of money for business deals (interest rates), fines in money for ‘wrong doing’, inheritance rules, laws concerning how private property is to be taxed or divided, etc. For a summary of the laws, see Babylonian law and Ancient economic thought.

Economic thought dates from earlier Mesopotamian, Greek, Roman, Indian, Chinese, Persian and Arab civilizations. Notable writers include Aristotle, Chanakya (also known as Kautilya), Qin Shi Huang, Thomas Aquinas and Ibn Khaldun through to the 14th century. Joseph Schumpeter initially considered the late scholastics of the 14th to 17th centuries as “coming nearer than any other group to being the ‘founders’ of scientific economics” as to monetary, interest, and value theory within a natural-law perspective. After discovering Ibn Khaldun’s Muqaddimah, however, Schumpeter later viewed Ibn Khaldun as being the closest forerunner of modern economics, as many of his economic theories were not known in Europe until relatively modern times.

Nonetheless, recent research indicates that the Indian scholar-philosopher Chanakya (c. 340-293 BCE) predates Ibn Khaldun by a millennium and a half as the forerunner of modern economics, and has written more expansively on this subject, particularly on political economy. His magnum opus, the Arthashastra (The Science of Wealth and Welfare), is the genesis of economic concepts that include the opportunity cost, the demand-supply framework, diminishing returns, marginal analysis, public goods, the distinction between the short run and the long run, asymmetric information and the producer surplus. In his capacity as an advisor to the throne of the Maurya Empire of ancient India, he has also advised on the sources and prerequisites of economic growth, obstacles to it and on tax incentives to encourage economic growth.

Microeconomics.

Microeconomics looks at interactions through individual markets, given scarcity and government regulation. A given market might be for a product, say fresh corn, or the services of a factor of production, say bricklaying. The theory considers aggregates of quantity demanded by buyers and quantity supplied by sellers at each possible price per unit. It weaves these together to describe how the market may reach equilibrium as to price and quantity or respond to market changes over time.

This is broadly termed supply and demand analysis. Market structures, such as perfect competition and monopoly, are examined as to implications for behavior and economic efficiency. Analysis of change in a single market often proceeds from the simplifying assumption that behavioral relations in other markets remain unchanged, that is, partial-equilibrium analysis. General-equilibrium theory allows for changes in different markets and aggregates across all markets, including their movements and interactions toward equilibrium.