Retailers work directly with the customer. These intermediaries work with wholesalers and distributors and often provide many different products manufactured by different producers all in one location. Customers can compare different brands and pick up items that are related but aren't manufactured by the same producer, such as bread and butter. Purchasing bread or medications directly from a manufacturer or pharmaceutical company would be time-consuming and expensive for a customer. But buying these products from a local retail "middleman" is simple, quick and convenient.