# Exponential growth

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**Exponential growth** occurs when the growth rate of the value of a mathematical function is proportional to the function's current value. In mathematics, the exponential function is used to model a relationship in which a constant change in the independent variable gives the same proportional change (i.e. percentage increase or decrease) in the dependent variable.

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## Quotes[edit]

- Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist.
- Attributed to Kenneth Boulding in United States Congress, House (1973),
*Energy reorganization act of 1973: Hearings, Ninety-third Congress, first session, on H.R. 11510*. p. 248

- Attributed to Kenneth Boulding in United States Congress, House (1973),