In economics, vendor lock-in, also known as proprietary lock-in, or customer lock-in, makes a customer dependent on a vendor for products and services, unable to use another vendor without substantial switching costs. Lock-in costs which create barriers to market entry may result in antitrust action against a monopoly. The camera industry is a good example of vendor lock-in. On many cameras, especially more expensive types, the lens can be removed and replaced with a different lens; this is known as an interchangeable lens system. The lenses are an important accessory to the camera and a source of revenue for whoever makes the lens.

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