Organizational discipline
Downward communication follows the organization's hierarchy, meaning that organizational discipline and member compliance is much easier to maintain.
Efficiency
Downward communication offers efficiencies because instructions and information come from the sources in power that are able to coordinate activities from the top of the organization. Employees receive feedback from the supervisors who manage them.
Effective communication of goals
Upper management can easily communicate goals and assign responsibilities regarding achieving those goals.
Ease of delegation
Delegation is much easier if the delegation comes directly from the vertical communication structure representing the chain of command.