Greenblatt’s magic formula: Why simplicity and discipline beat expensive advice

Key lessons from Joel Greenblatt’s investment philosophy.

A thought-provoking post recently circulated on social media, revisiting Joel Greenblatt’s famous 2017 Talks at Google lecture. In it, the Gotham Capital founder and Columbia Business School professor laid bare a paradox that cuts to the very heart of the modern investment industry: the formula to beating the market can fit on a paper napkin and costs nothing to learn, yet billions of pounds continue to flow into high-fee funds that consistently underperform.

Greenblatt, whose original hedge fund compounded at roughly 40% annually over two decades before returning outside capital, demystified his approach in The Little Book That Beats the Market. His philosophy can be distilled into eight simple words:

“Cheap and good beats expensive and average. Every time.”

For individual investors, Greenblatt’s framework offers profound insights, not merely into quantitative stock selection, but into investor psychology and the mechanics of the wealth management industry.

The two-line blueprint

The beauty of Greenblatt’s magic formula is its utter refusal to be complicated. Rather than relying on convoluted discounted cash flow models or proprietary black-box algorithms, it ranks companies using just two fundamental metrics:

1. Quality (“Good”): Return on Invested Capital (ROIC)
   How effectively does the business generate earnings from the capital tied up in its operations? A consistently high ROIC indicates a strong business model, a competitive moat, and capable capital allocators.
2. Valuation (“Cheap”): Earnings Yield
   Operating earnings (EBIT) relative to Enterprise Value. This strips away distortions from debt structures and local tax regimes, measuring what cash return the underlying business produces relative to the price paid to acquire the entire enterprise.

By combining the two rankings across a broad universe of liquid shares, an investor can identify the top 20 or 30 companies that combine high operating quality with bargain-basement prices. The portfolio is held for a disciplined 12-month period, rebalanced systematically, and repeated year after year.

Over multi-decade back tests, this simple screen has comfortably outpaced the wider market.

The industry’s best-kept secret: complexity sells

Why, then, does the institutional fund management industry exist in its current guise?

The investment industry thrives on complexity. To justify an annual management charge of 1% or management and performance fees of “2 plus 20”, institutions must project an aura of sophisticated wizardry. They employ armies of analysts, subscribe to expensive data terminals, and produce 50-page research notes.

Yet, as Greenblatt demonstrated, much of this activity merely generates friction, turnover, and fees – all of which erode net returns. A private investor armed with a spreadsheet and publicly available company disclosures can replicate the core principles of value investing (or more precisely hybrid value/quality) without paying a middleman for the privilege.

If it is so simple, why doesn’t everyone do it?

If the lecture is free on YouTube and the book costs less than a lunch, why hasn’t this strategy made active management obsolete?

The answer lies in behaviour, not knowledge.

1. The agony of the unfashionable
   A systematic screen for “cheap and good” rarely produces a portfolio of celebrated market darlings. Instead, it selects unloved, out-of-favour companies facing cyclical headwinds or temporary controversies. Buying what feels uncomfortable is emotionally demanding; holding it requires a steel stomach.
2. The inevitable droughts
   No strategy works all the time. Systematic value investing frequently undergoes periods of two, three, or even four consecutive years of underperformance, particularly during speculative bull runs when expensive momentum stocks dominate the indices. Most investors and almost all wealth managers will abandon a strategy before mean reversion takes place.
3. The seduction of narrative
   Individual investors are naturally drawn to exciting narratives – breakthrough technology, dramatic turnaround stories, or macro predictions. A rule-based ranking of ROIC and earnings yield offers zero excitement. It is boring, mechanical, and patient.

As Greenblatt himself often observed, the formula works in the long run precisely because it fails to work in the short run. If it produced market-beating returns every month, capital would flood in, arbitrage away the discount, and destroy the advantage.

Lessons for individual investors

For members of ShareSoc, Greenblatt’s thesis reinforces two enduring principles of successful long-term investing:

• Valuation is gravity: No matter how brilliant a company’s prospects appear, paying an excessive multiple severely impairs your long-term prospective return.
• Temperament beats intellect: Having the analytical tools to identify an undervalued business is only half the battle. The true edge lies in having the emotional stamina to adhere to a sound investment process when the crowd is running in the opposite direction.

The tools to achieve market-beating returns are not locked behind the walls of City institutions. They are widely accessible. The real test is whether we possess the discipline to apply them.

Cliff Weight, Chair of ShareSoc’s Education Committee and member of the Policy Committee