musicMagpie, a British-owned online retailer that sells refurbished electronics and second-hand computer games, consoles, books, films, and music, is known for an algorithm that determines the price of an item based on its popularity on competitors' websites.

The principle behind its purchase-and-sale algorithm is to minimize the amount of stock in musicMagpie's warehouse. This way, the company can stay attuned to market trends and customer preferences.