In merchandising, the mass effect is a strategy aimed at presenting a large assortment of products in a retail space. This approach generally involves stacking products vertically to create an impression of abundance. Consciously or unconsciously, consumers associate this abundance of products with increased popularity or value. This can be compared to the importance for a restaurant of having a large and visible customer base to attract passersby. An illustration of this strategy involves combining the mass effect with the presentation of offers. A concrete example of this concept could be illustrated with an image.