Following are the economies of scale : 1. Technical economies 2. Labour economies 3. Economies of…

Internal economies of scale accrue to an individual firm as a result of expanding its own scale of output, independently of the size of the industry as a whole; these include technical economies (1), labour economies (2), and managerial economies (4). By contrast, economies of concentration (3) arise from the localization of many firms of an industry in a single geographic area and are therefore external economies of scale. Thus, 1, 2 & 4 are internal economies.