Income elasticity of demand (YED) % D QD/% D Y Income elasticity of demand (YED): the responsiveness of the quantity demanded of a good to changes in consumer income. YED allows us to work out which goods are inferior, luxury and normal. When YED > 1 or <-1, demand is elastic. When YED is between -1 and 1, demand is inelastic. When YED < 0, goods/services are inferior. This means as income rises, demand for these goods decreases. (e.g. bus tickets) They vary inversely with income. When YED < -1, goods are very inferior (e.g. own-brand labels, cheap cuts of meat). When YED = 0, demand for the good is independent of income. When YED > 0, goods/services are normal. Demand for these goods vary directly with income, and the state of the economy. When YED is between 0 and 1, goods/services are necessary. When income increases, demand for these goods go up a proportional...
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