The Span Problem
Optimal span: 5-7 direct reports. At 8-10: manager effectiveness drops 20-30% (less coaching, slower decisions, more context switching). Above 10: effectiveness drops 40-50%.
Each report above 7 costs ~$100K in: reduced 1-on-1 quality, slower feedback cycles, delayed career development, increased attrition risk. Hire another manager at $200K rather than overloading at $400K+ in hidden costs.