Introduction:
The income effect is a change in consumer's purchasing power due to a change in their income level or purchasing power. It is an essential component of consumer behavior and is used to analyze the impacts of economic changes on consumer spending habits.

Relationship between Px and Qx:
The relationship between the price of a good and the quantity demanded is known as the law of demand. According to this law, there is an inverse relationship between the price of a good and the quantity demanded. As the price of a good increases, the quantity demanded decreases, and vice versa.

Income Effect:
When the price of a good changes, it can have an income effect on the consumer's purchasing power. The income effect refers to the change in a consumer's purchasing power due to a change in the price of a good.

Income Effect and Px and Qx:
The income effect can impact the relationship between the price of a good and the quantity demanded. However, it does not necessarily subscribe to the inverse relationship between Px and Qx.

For example, if the price of a luxury good like a yacht increases, the consumer's purchasing power decreases. The consumer may then choose to purchase fewer yachts and instead purchase more affordable goods. This would result in a decrease in the quantity demanded of yachts.

However, if the price of a necessity good like insulin increases, the consumer's purchasing power decreases. The consumer may then choose to purchase less of other goods, but they will still need to purchase insulin. This would result in a decrease in the quantity demanded of other goods, but not insulin.

Conclusion:
In conclusion, the income effect is an important aspect of consumer behavior that can impact the relationship between the price of a good and the quantity demanded. While there is generally an inverse relationship between Px and Qx, the income effect can sometimes result in a different outcome.