Answer :
This is due to the substitution effect: increases in quantity demanded that are attributable to the good becoming cheaper relative to other goods.
This is due to the income effect: Increases in quantity demanded that are attributable to changes in purchasing power as the price of a good falls.
This is due to the total effect: Increase in quantity demanded attributable to the combination of the income and substitution effect.
What is the income and substitution effect?
When the price of a good changes, there are two effects, the income effect and the substitution effect, that lead to a change in the quantity demanded of the good.
The substitution effect looks at the change in price of a good relative to other goods. When the price of a good falls, it becomes cheaper relative to other goods. As a result, consumers buy more of that good and less of the other good.
The income effect looks at how a change in price affects real disposable income. When the price of a good decreases, real disposable income increases. As a result, consumers can afford to buy more of that good as the consumers purchasing power has increased, holding money income constant.
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