Tie-in-sale is used to increase the profit by a manufacturer by allowing a consumer to purchase one product if they also buy another product.
A tie-in-sale results from a contract between a producer and a consumer that states that the customer can only get the desired good (the tying good) if he also agrees to buy another good (the tied good) from the producer.
The sale of a product to a buyer with the explicit requirement that a second product be purchased as well.
The second item could not be desired by the consumer or she might be able to find it cheaper elsewhere. Tie-in-sale that impede competition are prohibited.
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