When demand is elastic then improvement in technology will increase the equilibrium quantity and lowers the equilibrium price and total expenditure will increase because here quantity effect is greater than price effect and quantity effect increases revenue whereas price effect decreases.
when demand is inelastic then total expenditure will fall because demand is inelastic and quantity effect is less than price effect
when demand is unitary elastic then total expenditure will remain same because quantity effect will be same as price effect
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