The Quality Framework

Quantitative research has formalized the characteristics of businesses that consistently compound capital. In their landmark paper “Quality Minus Junk”, research defined the variables that drive the quality premium:

Profitability

Measured as profits per unit of book value (using gross profits, operating margins, free cash flows, and accruals). Highly profitable companies command a premium because they generate real economic surpluses.

Growth

Measured as the prior five-year growth in profitability metrics.

Safety

Measured by both market-based metrics (low beta) and fundamental metrics (low leverage, low earnings volatility, and low credit risk).

High-quality firms (high profitability, high growth, high safety) have consistently outperformed junk firms globally. The paper packages that spread as the Quality-Minus-Junk (QMJ) factor, which earned significant risk-adjusted returns across markets and decades.

In “What is Quality?”, empirical analysis verified that the quality premium is overwhelmingly driven by two categories: high return on capital (ROE, ROA, ROIC) and low capital reinvestment (firms that grow assets conservatively instead of aggressively diluting capital).