Weber's interest in the nature of power and authority, as well as his pervasive preoccupation with modern trends of rationalization, led him to concern himself with the operation of modern large-scale enterprises in the political, administrative, and economic realm. Bureaucratic coordination of activities, he argued, is the distinctive mark of the modern era. Bureaucracies are organized according to rational principles. Offices are ranked in a hierarchical order and their operations are characterized by impersonal rules. Incumbents are governed by methodical allocation of areas of jurisdiction and delimited spheres of duty. Appointments are made according to specialized qualifications rather than ascriptive criteria. This bureaucratic coordination of the actions of large numbers of people has become the dominant structural feature of modern forms of organization. Only through this organizational device has large- scale planning, both for the modern state and the modern economy, become possible. Only through it could heads of state mobilize and centralize resources of political power, which in feudal times, for example, had been dispersed in a variety of centers. Only with its aid could economic resources be mobilized, which lay fallow in pre-modern times. Bureaucratic organization is to Weber the privileged instrumentality that has shaped the modern polity, the modern economy, the modern technology. Bureaucratic types of organization are technically superior to all other forms of administration, much as machine production is superior to handicraft methods.