Positive Contrast Scope-Insensitivity

Abstract When consumers compare a worse product to a better product, negative contrast can make the worse product less attractive, and positive contrast can make the better product more attractive. We show that positive contrast is relatively scope insensitive: the size of the difference between products affects negative contrast but not positive contrast. Even when the difference between products is small enough to make negative contrast negligible, positive contrast remains strong. This means that when consumers compare a product to a slightly worse product, contrast makes the better product more attractive without making the worse product any less attractive. The asymmetry occurs because consumers are less likely to consider the size of the difference between products when evaluating the better product than when evaluating the worse product, such that nudging consumers to consider the size of the difference eliminates the asymmetry.