Question

Explain how income effect is responsible for the negative slope of the demand curve.

Answer 1

A negative slope on a demand curve implies that price and quantity required are moving in opposite (inverse) directions. The income effect directly drives this downhill slope via the following steps:

1. Price Drop: When the price of a product falls, the consumer’s real income increases.
2. Expansion of Power: Increased purchasing power allows the consumer to buy more units of that product with their current budget.
3. Inverse Result: As a result, a lower price point immediately correlates with higher demand.

Because a drop in price results in an immediate increase in the volume purchased, putting these points on a graph naturally causes the demand curve to slope downward from left to right, resulting in its trademark negative slope.