Buy One, Get One (BOGO) is a sales promotion where the purchase of one item is rewarded with a second item of the same product for free. Generally speaking, shoppers tend to overvalue the benefits of a ‘free’ product even when compared to higher-quality items sold at a discounted rate, which is why the BOGO sales tactic has become so popular. Using a BOGO discount technique creates a sense of urgency and encourages customers to make a purchase.