A camera manufacturer sells its cameras only to retailers who agree to buy the brand of film it sells, this is an example of a tying contract.
A tying contract is an agreement during which the retailer conditions the sale of 1 product (the "tying" product) on the buyer's agreement to get a separate product (the "tied" product) from the vendor.
Tying may limit client selection for consumers desirous to purchase one ("tying") product by forcing them to additionally purchase a second ("tied") product likewise. Typically, the "tied" product is also a less fascinating one that the client won't purchase unless needed to try to to therefore, or might like better to get from a different seller.
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