Suggesting that there are substantial differences between goods, products, and service products has been the source of great debate in marketing. Opponents of the division propose that "products are products", and just because there are some characteristics associated with service products and not goods products and vice-versa, does not mean customized strategies are generally necessary for each. Advocates provide evidence that these differences are significant. It is the position in this book that service products are different than goods products, and that service products represent an immense market sector.
Service products are reflected by a wide variety of industries: utilities, barbers, travel agencies, health spas, consulting firms, medical care, and banking, to name but a few, and they account for nearly 50 per cent of the average consumer's total expenditures, 70 per cent of the jobs, and two-thirds of the US Gross National Product (GNP). Clearly, the service sector is large and is growing. While all products share certain common facets, service products tend to differ from goods products in a number of ways.