As a general rule, how does span of control relate to organizational efficiency?

1. Each firm decides how many managers are needed at each level to supervise the work performed. 2. In general, the larger the span of control, the more efficient the organization. 3. A wide span means fewer levels of management, which increases efficiency and reduces costs. 4. No fixed optimal number such as ten is given, since the right span depends on the work being supervised. _Source: OpenStax Introduction to Business (CC BY 4.0), Ch 7 "Designing Organizational Structures", section 7.4 Span of Control_