A demand curve will have a positive slope when:

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Normally, demand curves have a negative slope, indicating that as price increases, quantity demanded decreases. However, in cases where the income effect of a price change outweighs the substitution effect, the demand curve can have a positive slope. This scenario is unusual and can occur with Giffen goods, where a price increase leads to higher demand because the income effect (reducing real income) dominates the substitution effect (encouraging substitution to cheaper goods).

A Demand Curve Will Have a Positive Slope When