Engel's law is an observation in economics stating that as income rises, the proportion of income spent on food falls, even if actual expenditure on food rises. In other words, the income elasticity of demand of food is between 0 and 1.
Engel's law doesn't imply that food spending remains unchanged as income increases: It suggests that consumers increase their expenditures for food products (in % terms) less than their increases in income.
One application of this statistic is treating it as a reflection of the living standard of a country. As this proportion or "Engel coefficient" increases, the country is by nature poorer, conversely a low Engel coefficient indicates a higher standard of living.
Communist thinkers cite Engel's coefficient as a quantitative measure of the misery of the working class. Some Marxists will expand the definition of Engel's coefficient as the percentage of income spent on food, shelter and clothing, i.e. to represent the percentage of income needed for the minimum requirements to stay alive.
- Engel, Ernst (1857). "Die Productions- und Consumtionsverhältnisse des Königreichs Sachsen". Zeitschrift des statistischen Bureaus des Königlich Sächsischen Ministerium des Inneren 8–9: 28–29. "... je aermer eine Familie ist, einen desto groesseren Antheil von der Gesamtausgabe muss zur Beschaffung der Nahrung aufgewendet werden ..."
- See Timmer, C. P.; Falcon, W. P.; Pearson, S. R. (1983). Food policy Analysis. Baltimore: Johns Hopkins University Press. p. 43. ISBN 0-8018-3072-9.
- Leon, P. (1967). Structural Change and Growth in Capitalism. Baltimore: Johns Hopkins.
- Pasinetti, L. (1981). Structural Change and Economic Growth: a Theoretical essay on the dynamics of the wealth of nations. Cambridge University Press. ISBN 0-521-23607-X.
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