Economic Definition of budget proportion. Defined.
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Term budget proportion Definition: One of three elasticity determinants (time period and substitute availability are the other two) stating that the elasticity of a good tends to be greater when the proportion of the budget devoting to the good is greater. In other words, the price elasticity of demand for housing (which takes up a sizeable portion of most budgets) is greater than that for a pair of socks (which does not take up much of most budgets). Even small percentage changes in goods that constitute a sizeable share of income can be quite large in absolute terms. As such, buyers tend to more sensitive to price changes in big-budget expenditures. This elasticity determinant works primarily for the price elasticity of demand.