Jobber, in merchandising, can be synonymous with "wholesaler", "distributor", or "intermediary". A business which buys goods and bulk products from importers, other wholesalers, or manufacturers, and then sells to retailers, was historically called a jobbing house (or jobbing center). A jobber is a merchant—e.g., (i) a wholesaler or (ii) reseller or (iii) independent distributor operating on consignment—who takes goods in quantity from manufacturers or importers and sells or resells or distributes them to retail chains and syndicates, particularly supermarkets, department stores, drug chains, and the like. One objective is to distribute goods at lower costs through economies of scale, which, in sophisticated operations, typically uses complex transportation models. In competitive markets, the practice is an integral part of supply chain management—one that might incorporate, among other things, operations research in areas of logistics involving supply chain networking, and supply chain optimization. A jobber is very different from a broker. A broker transacts on behalf of a merchandiser while a jobber supplies inventory at a merchandiser's site for consumers to purchase.