The Little Book That Still Beats the Market Ch. 2: Return on Capital

"A company that earns a high return on capital is a company with some special advantage over its competitors." — Joel Greenblatt

Investment Context

The formula's first half looks for "good" businesses using a single measure: return on capital (ROC).

Greenblatt explains it with a gum-shop analogy. Jason spends $400,000 opening a shop that generates $200,000 of annual profit — a 50% return on capital, an excellent business. A second shop costs the same $400,000 but generates $10,000, a 2.5% return — a poor one. The two may report identical sales, yet one converts shareholder capital into profit twenty times more efficiently.

The Wall Street Translation

Wall Street fixates on headline growth — "sales grew 20%." Greenblatt's point is that growth consuming large amounts of capital is worthless in itself.

1. A Measure of Efficiency

ROC captures how efficiently a business turns cash into more cash. A company earning 50% can fund its own expansion from profits, without borrowing and without issuing shares that dilute existing owners.

A concrete comparison: suppose companies A and B both want to double profits. A, at 50% ROC, needs another $400,000. B, at 5%, needs $4 million — money it can only raise through debt or new shares. So even when B doubles profits, earnings per share may not move at all.

2. A Measure of the Moat

In an open market a 50% return on capital attracts immediate competition. A company that sustains high ROC for years is demonstrating an economic moat — brand, patents, network effects, or cost advantage — that keeps rivals out.

Put differently: the level of ROC tells you how good the business is; the persistence of ROC tells you how deep the moat is. The formula sees only the former, which is an inherent limitation.

3. The Ranking System

The formula computes ROC for every stock and ranks them 1 to 3,500, highest first. Note this is a relative ranking rather than an absolute threshold, so in years when aggregate profitability is weak, even top-ranked names may post unimpressive absolute returns on capital.

Actionable Trading Rules

1. Use Greenblatt's definition: ROC = EBIT ÷ (net working capital + net fixed assets). This measures operating profit against the hard assets the business actually requires, and is harder to flatter with leverage than the more common ROE.
2. Avoid capital destroyers: Never invest in a company earning less on capital than the risk-free rate. If a business returns 3% while Treasuries pay 4%, management is steadily destroying value.
3. Test for consistency: A single high-ROC year may be a fluke — a one-off commodity spike, say. Require 20%+ sustained across at least five years.

Relevance to a Retirement Portfolio

The concept outlives the formula: ROC gives retirees a fast yardstick for business quality.

If you hold individual stocks, use it to check whether they genuinely create value. If you hold only index funds, it explains why equities beat bonds over long horizons — the average corporate return on capital exceeds the cost of borrowing.