Retailer definition including break down of areas in the definition. Analyzing the definition of key term often provides more insight about concepts. Retailer can be defined as: Intermediary that buys products from manufacturers or wholesalers and sells them to consumer. Retailers purchase products markup products and then sell them to the end user, the customer. Retailers have a business to business transaction on the purchase side and business to consumer transaction on the sales side. It can look like retailer do not add much value because the retailer is not actually producing the product but retailers do provide value, retailers being able to connect buyers and sellers.