The Discount Rate That Cannot Tell Good from Bad

A quality-anchored discount rate prices the business risks that drive default and permanent capital loss more effectively than beta-driven CAPM-WACC.

• Benguela compared a public-data quality proxy with CAPM-WACC across about 2,200 non-financial companies in 44 markets from June 2019 to June 2026. CAPM-WACC fell from 8.6% for net-cash companies to 6.4% for companies with net debt above three times EBITDA, while the quality-anchored rate rose from 8.0% to 10.0%.
• The quality-anchored rate had a +0.59 rank correlation with LSEG combined default probability at June 2026, compared with -0.23 for CAPM-WACC. Rates set between 2019 and 2023 also ranked later default probabilities correctly, at +0.41 versus -0.06 for CAPM-WACC.
• After removing every debt measure, the weakest operating-quality fifth was three to five times more likely to lose half its value within twelve months than the strongest fifth. The gap was 7.9% versus 2.3% among net-cash companies and 9.0% versus 1.9% above three times net debt to EBITDA.
• In a South African illustration, R100 invested in the lower-quality, more indebted cohort of six JSE companies in March 2016 was worth R47 by September 2026, against R201 for the higher-quality, debt-light cohort. The sample included Clicks and Murray & Roberts and was selected with hindsight.
• The archived 2022 scores ranked default risk, volatility and drawdowns correctly through September 2026. Among large companies, the typical quality-anchored pick returned 51% versus 40%, with Sharpe ratios of 1.19 for the quality approach, 1.05 for CAPM-WACC and 0.79 for broker targets.

Takeaway: Investors valuing equities with CAPM-WACC may lower the hurdle for fragile companies as leverage rises; Benguela argues for a quality-based rate that protects compounding across market regimes, while accepting weaker performance in rallies driven by expanding valuation multiples.