In case of a normal good,the income and substitution effects:

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In the case of a normal good, the income effect and substitution effect work together in the same direction, both tending to make the demand curve downward sloping. The income effect occurs when the consumer's purchasing power increases due to a rise in income, leading to an increase in the quantity demanded of a normal good. The substitution effect occurs when the consumer switches to a less expensive good due to a price rise in a normal good, leading to a decrease in the quantity demanded of the normal good. Together, these effects lead to a negative relationship between the quantity demanded and price, resulting in a downward sloping demand curve.

In Case of a Normal Good,the Income and Substitution Effects