How are equilibrium price and quantity affected when income of the consumers: (a) Increase, (b) Decrease
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(a) An increase in income of buyers will increase the demand (assuming normal goods) at the given price. It will lead to excess demand. This leads to competition among buyers, which raises the price. Increase in price leads to rise in supply and fall in demand. These changes continue till supply and demand become equal at a new equilibrium price. As there is an increase in demand only, equilibrium price rises.
(b) A decrease in income will decrease the demand (assuming normal goods) at the given price. It will lead to excess supply. This leads to competition among sellers, which reduces the price. Fall in price leads to decrease in supply and rise in demand. These changes continue till supply and demand become equal at a new equilibrium price. As there is a decrease in demand only, both equilibrium price and equilibrium quantity will fall.