In economics and industrial design, planned obsolescence (also called built-in obsolescence or premature obsolescence) is the concept of policies planning or designing a product with an artificially limited useful life or a purposely frail design, so that it becomes obsolete after a certain predetermined period of time upon which it decrementally functions or suddenly ceases to function, or might be perceived as unfashionable.

The rationale behind this strategy is to generate long-term sales volume by reducing the time between repeat purchases (referred to as "shortening the replacement cycle").

It is the deliberate shortening of the lifespan of a product to force people to purchase functional replacements.

Planned obsolescence tends to work best when a producer has at least an oligopoly.Before introducing a planned obsolescence, the producer has to know that the customer is at least somewhat likely to buy a replacement from them in the form of brand loyalty. 

In these cases of planned obsolescence, there is an information asymmetry between the producer, who knows how long the product was designed to last, and the customer, who does not. 

When a market becomes more competitive, product lifespans tend to increase.[