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Definition: income from Routledge Dictionary of Economics

The flow of value, expressed in money or in goods and services, accruing to a government, a firm or an individual over a specified time period.

See also: Haig-Simons definition of income; Hicksian income measure; money income; psychic income; real income; stock and flow concepts; wealth

  • Parker, R. H.; Harcourt, G. C.; Whittington, G. (eds) (1986) Readings in the Concept and Measurement of Income, 2nd edn, Philip Allan Oxford.

  • Summary Article: Income from Encyclopedia of Consumer Culture

    Income “is broadly speaking that what comes in” (Simons: The Definition of Income, 1938/1969, 64), incorporating monetary and/or natural income. Both kinds are key indicators for consumption patterns and thus for consumer culture. Monetary income can be generated from land, produced goods and services, and consumers' capital, and gained from trading profit. The following dimensions are important determinants of income: income type—gross versus net; the entity—varying from a rather macroeconomic (countries, population groups) to a microeconomic level (households, individuals); the timeframe—on a daily, weekly, monthly, or annual basis or regarding individuals' long-term income or life cycle view.

    Concepts of Income and Their Measurement

    Income is especially relevant in comparing different entities over time in various contexts and for different purposes. Thus, many psychological, social, economic, and managerial theories have the central idea of social comparison and use income as one of the main indicators. Today's concepts are mainly based on John Maynard Keynes's first systematic conceptualizing of income comparison in 1936, followed by James Duesenberry's notion on relative income and consumption in 1949, and Richard Easterlin's statement in 1974 that welfare does not depend on absolute but rather on relative income. In 1957, Milton Friedman introduced the concept of permanent income, which is closely related to the concept of welfare.

    Income is a key determinant of individual and household consumption patterns. For an individual, the income is the sum of all wages, salaries, interest rates, profits, payments, rents, transfers, and other received earnings. A widely used concept for comparing individuals' or households' welfare is disposable income that consists of earnings, self-employment and capital income and public cash transfers, from which income taxes and social security contributions paid by households are deducted. Comparing households' welfare calls for a definition of the term household itself. Here, different approaches coexist: the household as economic unit, dwelling unit, family, or network (Warner and Hoffmeyer-Zlotnik 2003). Moreover, an equalization of the income is essential to account for the different household sizes and compositions. One of the most widely used scales is the Organization for Economic Co-operation and Development (OECD) weighting scheme that is perpetually adjusted from the old Oxford scale over the modified OECD scale toward the square-root scale. The latter one uses the net income divided by the square roots of the number of household members as equivalence income.

    On a societal level, social income is a prominent measure to evaluate and compare countries' welfare. The OECD compares societal incomes, such as the gross domestic product (GDP), which measures the value added in a region—usually a country—by goods and services produced by labor and property or transaction profits. On a per capita basis, it reflects economic welfare or well-being. Purchasing power parities (PPP) equalize incomes and show relatively what the same shopping basket costs in different countries. PPPs are preferable over exchange rates. Converting the GDP via PPP to a common currency and considering the unequal purchasing power of national currencies (price levels) allow for international comparison of economic sizes and welfare.

    Application for Discussions on Poverty and Inequality

    Income inequality and poverty are highly prominent issues in policy and popular debate. Several income-related measurements are suitable for displaying income inequality and poverty. Two important measures of income inequality are the Lorenz curve and the Gini-coefficient. Whereas the Lorenz curve plots the cumulative shares of the population—from poorest to richest—against the cumulative share of income that they receive, the Gini-coefficient displays the area between the line-of-equality and the Lorenz curve. The values of the Gini-coefficient range between 0 in case of “perfect equality” and 100 in case of “perfect inequality.” Scandinavian countries have a Gini-coefficient of around 25 while the United States had one of 41 in 2007 (United Nations Development Programme 2007/2008).

    To measure income poverty, there are a number of approaches—all using disposable household income: Some take the shopping basket approach where typical costs of required goods and services that ensure a minimum living standard are assessed and equalized over time. Others use relative thresholds of income, for example, the 50 percentage or 60 percentage of the median income. The concept of income poverty experienced an extension by including other indicators such as the access to education, dwelling, health, and resources to debt. Another approach considers consumption streams instead of income, which is justified by a closer connection to long-term income. Using the latter approach, the difference is that households experiencing temporary income falls are not defined as poor. Thus, consumption data report generally lower poverty and inequality rates than mere income estimates. The measurement of poverty has strong policy implications, for example, how to reduce poverty or how to equalize opportunities.

    On both individual and societal levels, monetary income is often thought of as a proxy for full income. Besides financial aspects, full income incorporates other nonmonetary incomes such as leisure or health. However, the nonmonetary income is difficult to assess. For example, involuntary leisure time due to unemployment might be evaluated rather low whereas voluntary leisure is estimated to be high in value, but attempts to price nonmonetary income lead to the same hourly value for both types of leisure. On the societal level, the description of values and goods that are produced within a society depends on the definition of goods and services that count as productive and on the values ascribed to them.

    See also:

    Debt, Economic Indicators, Economics, Household Budgets, Inequalities, Keynes, John Maynard, Leisure, Money, Poverty, Well-Being

    Further Readings
  • Case, Karl E., Fair, Ray C., and Oyster, Sharon M., Principles of Economics. 9th ed. Upper Saddle River, NJ: Prentice Hall, 2009.
  • Eurostat Consumers in Europe. Luxembourg: Office for Official Publications of the European Communities, 2009. ISBN 978-92-79-11362-8.
  • Organization for Economic Co-operation and Development [OECD]. What are Equivalence Scales? Paris: OECD Social Policy Division, 2005.
  • Organization for Economic Co-operation and Development [OECD]. OECD Factbook 2009: Economic, Environmental and Social Statistics. Paris: OECD, 2009.
  • Simons, Henry C. “The Definition of Income.” In Readings in the Concept and Measurement of Income, edited by Parker, Robert H., 63-73. London: Cambridge University Press, 1969. Originally published in Personal Income Taxation: The Definition of Income as a Problem of Fiscal Policy, Chicago: University of Chicago Press, 1938.
  • United Nations Development Programme (UNDP). Human Development Report 2007/08. New York: Palgrave MacMillan.
  • Warner, Uwe, and Hoffmeyer-Zlotnik, Jürgen H. P. “How to Measure Income.” In Advances in Cross-national Comparison, edited by Hoffmeyer-Zlotnik, Jürgen H. P. and Wolf, Christof, 307-326. New York: Kluwer Academic/Plenum, 2003.
  • Gwozdz, Wencke
    SAGE Publications, Inc.

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