1 Demographics. This includes industry classification, for example using the North American Industry Classification System (NAICS) which categorises firms according to what they produce. Firms might also be classified as original equipment manufacturer (OEM) firms which make end products to sell to consumers and others, as end users which use up the products entirely in the course of their business, or as aftermarket or maintenance, repair and operations (MRO) firms which provide services to companies and consumers. Demography would also include geographic location and financial status – credit rating, in other words.