Do Economic Moats Beat the Market?

Why It Matters

The findings show that moat‑based indexing does not generate excess returns, prompting investors to favor cheaper market‑weighted exposure or more precise style screens, and to consider sophisticated hedged strategies for any moat premium.

Key Takeaways

• Wide‑moat stocks beat no‑moat stocks by ~20% annual return gap.
• Both wide‑moat and no‑moat groups underperform the S&P 500 after size adjustment.
• Value‑vs‑growth classification predicts returns better than moat ratings.
• Wide‑moat funds offer no alpha versus low‑cost S&P 500 index.
• Long/short moat strategy needs careful short‑side liquidity management.

Pulse Analysis

The economic moat framework, popularized by Warren Buffett and quantified by Morningstar, categorizes companies by the durability of their competitive edges—high switching costs, network effects, patents, cost advantages, or efficient scale. While the concept resonates with investors seeking stable cash‑flows, the sheer concentration of wide‑moat firms in large‑cap space means they already dominate market‑weighted benchmarks. Consequently, a portfolio that simply aggregates all wide‑moat names mirrors the performance of the S&P 500, offering no cost‑effective edge over a low‑fee index fund.

The April 2026 study by K. Stephen Haggard rigorously tests this intuition across more than five thousand NYSE and NASDAQ stocks. After stripping out size, age, sector and exchange effects, the supposed moat premium evaporates, and in some regressions flips negative. By contrast, the classic value‑vs‑growth style classification—derived from five objective financial ratios—explains a larger share of return variance. This suggests that investors can achieve comparable, if not superior, predictive power using readily available style scores rather than the more subjective moat ratings, which cover only a fraction of the universe.

For practitioners, the practical takeaway is clear: avoid paying premium fees for wide‑moat mutual funds that merely replicate market returns. Instead, employ a value‑oriented screen to isolate high‑quality equities, or, for the sophisticated, construct a market‑neutral long‑wide/moat, short‑no‑moat portfolio to harvest the residual spread. Such a strategy demands diligent short‑side selection to navigate liquidity constraints and dividend obligations, but it offers a disciplined path to capture the moat advantage without bearing unnecessary market risk.