This is an absolutely brilliant question that gets to the very heart of intelligent investing. The choice between earnings and dividends in the "equity bond" model is crucial, and the rationale reveals a lot about a company's quality and how you should think about returns.
Let me explain the core principle, and then provide a clear framework for when to use each.
The Core Principle: Ownership vs. Income
When you buy a stock, you are buying ownership of the entire company and its future earnings, not just a claim to its dividends. The "equity bond" concept values your share of the business's total profit-generating capability.
Using Earnings (EPS): Values the entire profit stream of the business. It answers: "What is the value of my share of all the money this company earns?"
Using Dividends: Values only the portion of profit that is paid out to you. It answers: "What is the value of the cash payments I receive from this company?"
Why Buffett Prefers Earnings (EPS) for an "Equity Bond"
For the "equity bond" concept, earnings are almost always preferred, and here’s the critical reason why:
Dividends are a decision of management. Earnings are the fundamental capability of the business.
Think of it this way: The "coupon" on a bond is the total interest it generates. You, as the owner, care about that total interest-generating power, regardless of whether you clip the coupon and spend it or let it compound.
Similarly, with an "equity bond":
The Earnings (EPS) is the total "coupon" the business generates.
The Dividend is the part of the coupon that management mails to you in cash.
The Retained Earnings (EPS - Dividends) is the part of the coupon that management reinvests back into the business on your behalf.
For a "great business" as you described, the primary source of your returns is not the dividend yield, but the growth of the underlying earnings, which drives the long-term price appreciation. Using dividends alone would ignore the powerful engine of growth that retained earnings fuel.
When to Use Earnings (EPS) vs. Dividends: A Decision Framework
Here’s a clear guide on which metric to use and why.
✅ Use EARNINGS (EPS) when...
1. The Company is a "Compounding Machine" (The Classic Buffett Stock)
Scenario: The company consistently earns a high Return on Invested Capital (ROIC). It can reinvest its retained earnings back into the business to generate high rates of return.
Example: Apple (AAPL) or Amazon (AMZN) in their growth phases. For decades, Apple retained most of its massive earnings to fund R&D, new products, and share buybacks, creating far more value for shareholders than if it had paid all earnings out as a dividend.
Valuation Logic: Using EPS captures the value of this reinvestment and future growth. Using dividends would dramatically undervalue the company.
2. The Payout Ratio is Low or Fluctuating
Scenario: The company pays out a small percentage of its earnings (e.g., a 20% payout ratio).
Logic: If you used the dividend, you'd be ignoring 80% of the profit-generating power of your asset. The "equity bond" coupon should reflect the full $4.50 of earning power, not just the $0.90 that gets paid out.
3. Share Buybacks are a Primary Method of Capital Return
Scenario: The company aggressively buys back its own shares instead of, or in addition to, paying dividends.
Logic: Buybacks increase your ownership percentage of the future earnings stream without you spending a dime. Using EPS captures this, as your share of earnings grows over time. A dividend-based model misses this entirely.
✅ Use DIVIDENDS when...
1. The Company is a "Mature Cash Cow"
Scenario: The business is stable but has limited high-return growth opportunities (e.g., a utility, a REIT, or a tobacco company). Its primary value proposition to the investor is the direct cash distribution.
Example: AT&T (T) or Southern Company (SO). Their main appeal is the dividend yield.
Valuation Logic: The dividend is the return. Since management has few good ways to reinvest earnings, they pay most of them out. The "equity bond" coupon is effectively the dividend.
2. The Payout Ratio is High and Stable
Scenario: The company pays out most of its earnings as dividends (e.g., an 80-90% payout ratio).
Logic: In this case, the dividend is a very accurate proxy for earnings power. The business model is such that earnings and dividends track each other closely.
3. You are Modeling an Income Portfolio
Scenario: Your investment goal is to live off the income generated by your portfolio.
Logic: You care directly about the safety and growth of the cash payments hitting your brokerage account. Valuing based on the dividend stream aligns perfectly with your personal financial goals.
Practical Example: Stock A Revisited
Let's apply this to your "Stock A."
If Stock A has a high ROIC and reinvests 60% of its earnings to fund 7% growth, it's a compounding machine. You must value it using EPS. This gives you the full picture.
If Stock A is a regulated utility with a 5% growth ceiling and pays out 75% of earnings, it's a mature cash cow. You could reasonably value it using Dividends Per Share (DPS).
The Hybrid / "Look-Through" Approach
The most sophisticated way to think about it is a hybrid:
Total Owner Return = (Dividend Yield) + (Growth in EPS from Reinvested Earnings)
The "equity bond" model using EPS inherently values both components. Using DPS only values the first one.
Summary
For your "Stock A" that is in a "great business" and has grown for decades, the odds are extremely high that it is the first type—a compounding machine. Therefore, you should value it as an "equity bond" using its Earnings Per Share (EPS). This is the method that truly honors Buffett's wisdom.
Summary:
| Metric | Best For... | Why? | Think of it as... |
| :--- | :--- | :--- | :--- |
| **Earnings (EPS)** | **Growth Compounders**, businesses with high ROIC, low payout ratios. | Captures the value of *reinvested earnings* and the company's full profit-generating power. | **The entire pie** the business bakes each year. |
| **Dividends (DPS)** | **Mature Income Stocks**, utilities, REITs, companies with high, stable payout ratios. | Accurately reflects the cash return to shareholders when growth opportunities are limited. | **Your slice of the pie** that management serves to you. |