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"Buy one, get one free", or "Buy one, get one" is a common form of sales promotion. While rarely presented to customers in acronym form, this marketing technique is universally known in the marketing industry by the acronyms BOGO and BOGOF, and it is regarded as one of the most effective forms of special offers for goods.
Economist Alex Tabarrok has argued that the success of this promotion lies in the fact that the price actually takes into account the fact that two items are being sold. The price of "one" is somewhat nominal and is typically raised when used as part of a buy one get one free deal. Whilst the cost per item is proportionately cheaper than if bought on its own, it is not actually half price.
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