All inclusive usa family vacations for If, in a manufacturing firm, engineers, accountants or computer programmers are on payroll, their product is counted toward manufacturing output; if the firm outsources these tasks to specialized firms, it would be counted toward the service sector. Thus, while the size of the servservices 751 ice sector has undoubtedly grown, and services make by far the greatest contribution to value added in most economies, its exact dimension cannot be quantified with precision. Service classification. Several methods of classifying services have emerged. The functional method, which is generally used by international organizations and national income statistics, groups traded services”which must be distinguished from non-tradable services”according to the tasks they perform. Factor services (i.e. All inclusive usa family vacations 2016.