Abnormal Earnings Growth Model

Introduction to Abnormal Earnings Valuation

The Abnormal Earnings Growth Model (AEGM), also known as the Residual Income Valuation Model or the Ohlson Model, represents one of the most theoretically robust approaches to equity valuation. Developed by James Ohlson in the 1990s, this framework links a firm's market value directly to its accounting numbers, specifically book value and future abnormal earnings. Unlike traditional valuation models that focus solely on cash flows or dividends, AEGM explicitly recognizes that value is created when a firm earns more than its cost of equity capital.

At its core, the model states that a company's equity value equals its book value plus the present value of expected future abnormal earnings. Abnormal earnings are defined as the difference between a firm's actual earnings and the earnings that equity holders would require as a minimum return on their investment (book value multiplied by the cost of equity). This seemingly simple adjustment has profound implications for how we think about value creation and measurement.

AEGM vs. Discounted Cash Flow (DCF)

The DCF model is perhaps the most widely used valuation methodology in practice. It values a firm by discounting projected free cash flows at the weighted average cost of capital. While DCF is theoretically sound, it has several limitations that AEGM addresses:

• Cash flow forecasting difficulty: For many firms, particularly those in financial services, high-growth technology, or distressed situations, forecasting free cash flows is notoriously unreliable. AEGM uses accounting earnings, which are more stable and directly observable.
• Terminal value dominance: In DCF, the terminal value often accounts for 70-90% of the total value, making the valuation highly sensitive to long-term growth assumptions. AEGM distributes value more evenly across the forecast horizon, reducing terminal value sensitivity.
• Value creation visibility: DCF tells you what a company is worth but not why. AEGM decomposes value into book value and the premium from future abnormal earnings, providing direct insight into value drivers.
• Negative cash flows: Firms with negative free cash flow (common in growth phases) produce negative value in DCF, which is counterintuitive. AEGM handles negative earnings gracefully through the book value anchor.

AEGM vs. Dividend Discount Model (DDM)

The DDM values a stock as the present value of expected future dividends. While conceptually simple, DDM suffers from practical limitations:

• Dividend irrelevance: Many profitable firms pay no dividends, forcing analysts to make arbitrary assumptions about future dividend initiation. AEGM does not require dividend forecasts, relying instead on earnings data.
• Payout ratio assumptions: DDM requires assumptions about future payout ratios, which can vary significantly over time. AEGM avoids this complexity entirely.
• Clean surplus relation: AEGM is built on the clean surplus accounting identity (changes in book value equal earnings minus dividends), which provides a rigorous link between the balance sheet and income statement that DDM lacks.

Comparison Table

Feature	AEGM	DCF	DDM
Primary Input	Earnings & Book Value	Free Cash Flows	Dividends
Terminal Value Sensitivity	Low	High	Medium
Works for Non-Dividend Stocks	Yes	Yes	No
Financial Sector	Excellent	Poor	Fair
Negative Cash Flow Firms	Good	Poor	Fair
Value Driver Insight	High	Medium	Low
Complexity	Moderate	Moderate	Simple

AEGM vs. Other Approaches

Residual Income Valuation

AEGM is closely related to the Residual Income (RI) model, sometimes used interchangeably. However, AEGM specifically focuses on the growth rate of abnormal earnings, providing a direct link to earnings growth forecasts that analysts commonly use. The RI model typically expresses value as book value plus discounted residual income, while AEGM frames it in terms of capitalized earnings plus the present value of abnormal earnings growth.

Economic Value Added (EVA)

EVA, developed by Stern Stewart & Co., is a performance measurement framework derived from the same theoretical foundations as AEGM. While EVA focuses on measuring past and current economic profit, AEGM is forward-looking and designed specifically for valuation. Both frameworks emphasize that value is created only when returns exceed the cost of capital.

Multiples (Comparable Company Analysis)

Trading and transaction multiples offer a market-based shortcut to valuation but suffer from severe limitations: they assume comparable firms are truly comparable, they ignore differences in growth, risk, and profitability, and they provide no intrinsic value anchor. AEGM provides a fundamental value based on firm-specific expectations, making it a superior tool for investment decisions.

How Abnormal Earnings Are Used in Practice

In practice, abnormal earnings analysis is applied across several domains:

• Equity research: Sell-side analysts use AEGM-derived price targets as a complement to DCF and multiples, particularly for bank and insurance company valuations where cash flow models fail.
• Portfolio management: Asset managers screen for stocks trading below their residual income value, identifying potential value opportunities that market-based metrics miss.
• M&A due diligence: Acquirers use abnormal earnings frameworks to quantify synergy values and assess whether target companies are creating or destroying economic value.
• Corporate finance: CFOs and strategic planners use economic profit metrics to evaluate internal investment opportunities and divisional performance.
• Credit analysis: Bond analysts incorporate abnormal earnings trends to assess a firm's ability to generate sustainable earnings for debt service coverage.

The growing adoption of AEGM reflects a broader shift toward accounting-based valuation models that bridge the gap between financial reporting and economic reality. As accounting standards evolve and data availability improves, the practical applications of abnormal earnings analysis will continue to expand.

For a complete guide with formulas, worked examples, and Excel templates, visit the Abnormal Earnings Growth Model page on our financial wiki.