The majority of deal-of-the-day sites work directly with local businesses and online retailers to develop deals significantly discounted compared to recommended retail prices. Using a group buying formula, a minimum and maximum number of deals are made available. Typically, deal of the day sites segment merchandise by specific designer sales. Deals are typically only offered for 24 hours, although daily deal websites are increasingly offering alternative, longer deal buying periods to increase sales and allow multiple deals to run in a single location concurrently.