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If the price of a substitute (Y) of good X increases, what impact does it have on the equilibrium price and quantity of good X ?

Answer» If the price of good Y falls, the demand of given good X will fall as now it will be cheaper to buy good Y and consumers will reduce the demand of good X as good X and good Y are substitute goods. Decrease in the demand of good X will lead to a leftward shift in its demand curve. At the old equilibrium price, there will be excess supply in the market and as a result of this there will emerge a competition among sellers as they will not be able to sell what they want at the ongoing market price. Fall in price will lead to rise in demand and fall in supply. As a result, equilibrium price and equilibrium quantity of good X falls.


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