1) Ed = 1.2 > 1 i.e. Elastic demand
When demand is elastic then decrease in price causes increase in total revenue.
2) Elasticity of demand depends upon the time period. Demand is inelastic in short period but elastic in long period. It is so because in the long-run, a consumer can change his habits more coveniently than in the short period.
Demand for gasoline is elastic in long run because consumer adjust towards or againt gasoline in the long run if price of gasoline reduces or increases.
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