Marketing academics have shown that retailers should think of both the direct and indirect effect of substantial price promotions when evaluating their impact on profit. To make a very precise analysis one should also include effects over time. Deep price promotions may cause people to bulk-buy (stockpile), which may invalidate the long-term effect of the strategy. This is the association rule analysis.
When automobile dealerships use this practice, they offer at least one vehicle below cost and must disclose all of the features of the vehicle (including the VIN). If the loss-leader vehicle has been sold, the salesperson tries to sell a more upscale trim of that vehicle at a slightly discounted price, as a customer who has missed the loss-leading vehicle is unlikely to find a better deal elsewhere.
Loss leaders can be an important part of companies' marketing and sales strategies, especially during dumping campaigns.