For a normal good,the substitution and income effects of a price decrease work in the same direction to increase the quantity demanded of that good.

Question

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When the price of a normal good decreases, the substitution effect causes consumers to switch from substitute goods to the relatively cheaper good, increasing quantity demanded. At the same time, the income effect increases consumers' purchasing power, making them able to afford more of the good at any given price, also increasing quantity demanded. Therefore, both effects work in the same direction to increase the quantity demanded of a normal good.

For a Normal Good,the Substitution and Income Effects of a Price