Multiplier is defined as the relationship between a change in the national income and the primary alteration in expenditure that brought it about.

In a simple model, the multiplier effect depends on the marginal propensity to consume.

Also see: multiplier-accelerator

Source:

R F Kahn, ‘The Relationship of Home Investment to Employment’, Economic Journal, vol. XLI (June, 1931), 173-98

## Mathematics

- Multiplier (coefficient), the number of multiples being computed in multiplication, also known as a coefficient in algebra
- Lagrange multiplier, a scalar variable used in mathematics to solve an optimisation problem for a given constraint
- Multiplier (Fourier analysis), an operator that multiplies the Fourier coefficients of a function by a specified function (known as the symbol)
- Multiplier of orbit, a formula for computing a value of a variable based on its own previous value or values; see Periodic points of complex quadratic mappings
- Characteristic multiplier, an eigenvalue of a monodromy matrix
- Multiplier algebra, a construction on C*-Algebras and similar structures

## Electrical engineering

- Binary multiplier, a digital circuit to perform rapid multiplication of two numbers in binary representation
- Analog multiplier, a device that multiplies two analog signals
- Frequency multiplier, a device that generates a signal at an integer multiple of its input frequency
- Voltage multiplier, an electrical circuit that converts AC electrical power from a lower voltage to a higher DC voltage.
- Schweigger multiplier, an early galvanometer

## Macroeconomics

- Multiplier (economics), any measure of the proportional effect of an exogenous variable on an endogenous variable
- Fiscal multiplier, the ratio of the change in aggregate demand to the change in government spending that caused it
- Money multiplier, the ratio of the money generated by the banking system to the central bank’s increase in the monetary base that caused it

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