A loss leader (also leader) is a pricing strategy where a product is sold at a price below its market cost to stimulate other sales of more profitable goods or services. With this sales promotion/marketing strategy, a "leader" is used as a related term and can mean any popular article, i.e., one sold at a normal price.
One use of a loss leader is to draw customers into a store where they are likely to buy other goods. The vendor expects that the typical customer will purchase other items at the same time as the loss leader and that the profit made on these items will be such that an overall profit is generated for the vendor.
"Loss lead" describes the concept that an item is offered for sale at a reduced price and is intended to "lead" to the subsequent sale of other items, the sales of which will be made in greater numbers, or greater profits, or both. It is offered at a price below its minimum profit margin--not necessarily below cost. The firm tries to maintain a current analysis of its accounts for both the loss lead and the associated items, so it can monitor how well the scheme is doing, as quickly as possible, thereby never suffering an overall net loss.
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.
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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.
Some examples of typical loss leaders include milk, eggs, rice, and other inexpensive items that grocers would not want to sell without other purchases.
The Warner/Reprise Loss Leaders were a series of promotional sampler compilation albums released by Warner Bros. Records throughout the 1970s. Each album (usually a 2-record set) contained a wide variety of tracks by artists under contract to Warner Bros. and its subsidiary labels (primarily Reprise Records); often these were singles, B-sides, non-hit album tracks, or otherwise obscure material, all designed to arouse interest in the artists' regular albums. Warner advertised the Loss Leaders albums by inserting special illustrated inner sleeves in all of its regular album releases, listing all of the currently available Loss Leaders and including an order form. Each loss leader double album was priced at US$2, significantly less than a comparable regular-release double album of the time. The first Loss Leaders compilation was The 1969 Warner/Reprise Songbook, featuring a wide range of artists from Miriam Makeba to The Mothers of Invention; the last of the original series was the punk and new wave-themed Troublemakers in 1980.
In 1979, American businessman Earl Muntz decided to sell blank tapes and VCRs as loss leaders to attract customers to his showroom, where he would then try to sell them highly profitable widescreen projection TV systems of his own design. His success continued through the early 1980s.
Chevrolet's Corvette was originally intended in the 1950s to be an "image builder" and loss leader for General Motors, the idea being that men would go to showrooms to look at this "automotive Playboy Bunny"--which they knew they could not afford--and end up purchasing a lower-cost model. However, it enjoyed significant sales successes in the 1960s and produced a substantial annual profit.
On its launch in 1959 the British Motor Corporation's Mini car was sold at a starting price (including taxes) of £496 for its most basic model, and it was estimated that BMC lost £30 per car sold at this price. However the headline-grabbing price was significantly lower than that of the car's contemporary rival, the Ford Anglia - indeed the only cheaper four-wheeled, four-seater car on the British car market at the time was very basic and old-fashioned Ford Popular, which sold for only £2 less than the basic Mini. While BMC lost money on every basic Mini sold, such cars were unattractive to many buyers since they lacked features such as heaters, floor carpets and opening rear windows and BMC priced the better-equipped models (which cost from £537) to make a small profit, using the basic car as a loss-leader to allow the promotion of a starting price below the significant £500 mark and to make the Mini at least appear to undercut its main rival on price. The ploy did not work entirely as BMC intended - even in its most basic form the Mini was far superior in many areas to its rivals while also being lower in price. BMC sold far more basic Minis than it had anticipated, meaning that it sold many Minis at a significant loss. Despite the car being a bestseller in Britain (and several other markets) it made little to no profit for many years.
Supermarkets sell food staples such as bananas or milk at less than the cost at which they were purchased in order to draw customers to their business. These items are typically strategically placed far from the entrances of the store to enhance this effect. In the case of milk, dairy farmers claim that so-called "price wars" are devaluing milk in the minds of consumers.
Many toy store chains and online retailers sell diapers or nappies as a loss leader in order to entice parents into the store in the hopes that the children will spot toys, bottles or other items that the family "needs". 
Large hardware stores such as Home Depot often sell larger tools, such as drills or electric saws, for cost or below. They do this expecting customers to buy accessories such as blades, drill bits, stands, or cases, along with the new tool. These items tend to have a much higher profit margin, and are often impulse buys.