The WACC of Marsh & McLennan Companies Inc (MMC) is 6.8%.
| Range | Selected | |
| Cost of equity | 6.30% - 8.20% | 7.25% |
| Tax rate | 24.50% - 25.40% | 24.95% |
| Cost of debt | 4.00% - 4.60% | 4.30% |
| WACC | 6.0% - 7.7% | 6.8% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.54 | 0.6 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 6.30% | 8.20% |
| Tax rate | 24.50% | 25.40% |
| Debt/Equity ratio | 0.13 | 0.13 |
| Cost of debt | 4.00% | 4.60% |
| After-tax WACC | 6.0% | 7.7% |
| Selected WACC | 6.8% | |