2.5.8 (HL)—Importance of YED

YED helps firms plan for changing incomes.

Firms use income responsiveness to anticipate which products expand or contract during booms and downturns, alongside costs and competition.

Example

A premium travel firm with high positive YED may see demand fall faster than income during a recession.

Combine the elasticity estimate with the expected income change and the firm’s product mix.

Forecasting from YED assumes other major determinants do not shift at the same time.

YED also explains sectoral change: as average incomes rise, demand tends to grow less than proportionately for necessities and more than proportionately for income-elastic services and luxuries, shifting employment and output toward those sectors. Firms combine estimated YED with an income forecast to plan capacity, product mix and risk; coefficients can change across income ranges and over time.