# Variable

From ACT Wiki

1. *Income - expenditure - adjective.*

Variable costs and income are amounts that can change within a forecasting or review period.

Contrasted with fixed costs and income.

The term "variable" is a relative one, because - when a long enough time frame is considered - most items become variable.

2. *Financial maths - noun.*

In financial maths, a variable is a number that can take more than one value.

For example, a rate of inflation.

Contrasted with a *constant*, that - by definition - does not change.

3. *Analysis - modelling - inputs - assumptions.*

An relevant amount that - if it were to change - would be expected to change the results of analysis or modelling.

## See also

- Argument
- Constant
- Continuous random variable
- Contribution
- Correlation
- Cost behaviour
- Dependent variable
- Direct costs
- Discrete random variable
- Expense
- Exponential constant
- Financial analysis
- Fixed cost
- Flexible budgeting
- Gearing
- Independent variable
- Indirect costs
- Input
- Management accounting
- Model
- Operational gearing
- Semi-fixed cost
- Semi-variable cost
- Variable cost
- Variable currency
- Variable net asset value
- Variable rate