Revenue and Earnings Growth: What Drives Sustainable Value

Key Takeaways

• Revenue and earnings growth are connected by the identity: EPS growth approximately equals revenue growth plus margin change minus share count change.
• Damodaran's fundamental growth identity ties growth to capital efficiency: growth rate equals reinvestment rate times ROIC, so low-ROIC reinvestment produces anemic growth regardless of volume.
• EPS can grow through buybacks with flat revenue, an important distinction because that kind of growth has a ceiling set by free cash flow yield.
• Growth rates mean-revert; Damodaran's empirical work shows this is one of the strongest regularities in equity analysis, making extrapolation of peak rates especially dangerous.

What It Is

Revenue growth is the percentage change in sales from one period to the next. It reflects commercial momentum: new customers, higher prices, new products, or geographic expansion.

Earnings growth is the percentage change in net income or earnings per share (EPS) over the same period. It layers operating margin, financing costs, taxes, and share count changes on top of the revenue story. Because those layers can amplify or reverse what is happening at the top line, earnings growth and revenue growth often diverge.

The Intuition

A stock's long-run value is anchored to the cash the business will generate for its owners. Holding valuation multiples constant, the intrinsic value of an equity rises roughly in step with sustainable earnings growth. That is why analysts devote so much effort to forecasting growth rates, and why management teams so often highlight them in earnings calls.

The catch is that growth is not free. To grow, a company must reinvest in factories, inventory, salespeople, or acquisitions. Aswath Damodaran puts it directly: growth without reinvestment is either an accounting illusion or a one-time margin gain. Real, repeatable growth has a cost, and value is only created when the return on reinvested capital exceeds the cost of that capital.

How It Works

The simplest way to compute growth is period over period:

Revenue growth  = (Revenue_t - Revenue_t-1) / Revenue_t-1
Earnings growth = (EPS_t     - EPS_t-1)     / EPS_t-1

For multi-year comparisons, use CAGR on the endpoints. For cyclical businesses, average across a full cycle to avoid cherry-picked start and end points.

The more useful step is to decompose earnings growth into its drivers. Ignoring taxes and interest, the identity is:

Earnings growth ~= Revenue growth + Margin change - Share count change

So a company can post double-digit EPS growth in three distinct ways: sell more, earn more per dollar of sales, or shrink the share count through buybacks. These have very different economics.

Damodaran's fundamental growth identity goes one step further and ties growth to capital efficiency:

Expected growth in operating income = Reinvestment Rate x Return on Invested Capital (ROIC)

A company that reinvests 40 percent of after-tax operating income at a 20 percent ROIC grows operating income at roughly 8 percent a year. If ROIC is only 5 percent, the same reinvestment produces just 2 percent growth. This is why quality investors care about ROIC, not just growth.

Worked Example

Consider two hypothetical companies, each growing EPS at 12 percent a year.

Company A grows revenue at 12 percent with stable margins and a flat share count. Earnings growth is fully backed by commercial expansion and steady ROIC.

Company B has flat revenue. It cut operating costs, expanded margins from 8 percent to 10 percent, and repurchased 4 percent of its shares. EPS still grew 12 percent, but the business sold no more product than the year before.

Both deliver the same EPS growth number, but only Company A is actually a larger business at year end. Company B has used margin and buybacks to dress up a stagnant top line. That is not automatically bad, margin expansion and disciplined buybacks are legitimate tools, but it is not the same kind of growth, and it cannot continue indefinitely. Margins have a ceiling, and a company generating a 2 percent free cash flow yield cannot retire more than about 2 percent of its shares a year without taking on debt.

Common Mistakes

1. Extrapolating peak growth rates indefinitely. Triple-digit growth in early years is almost always the result of a small base. As revenue scales, the law of large numbers kicks in. Damodaran's work shows that mean reversion in growth rates is among the strongest empirical regularities in equity analysis. Building a DCF on a sustained 30 percent growth rate for a large company is usually wrong.

2. Treating acquired revenue as organic growth. If a company grows sales 15 percent but 10 percentage points came from acquisitions, the underlying business grew just 5 percent. Worse, acquisitions create value only when the price paid is below the target's intrinsic value; many are not. Always look for an organic growth figure in the MD&A.

3. Ignoring buyback arithmetic. EPS can rise mechanically when share count shrinks, even with flat net income. McKinsey's research shows that after adjusting for economic profit, there is little statistical link between buyback intensity and long-run shareholder value. Judge buybacks by whether they were done below intrinsic value, not by their EPS boost.

4. Confusing company growth with market growth. A company growing at 8 percent in a market that is growing at 12 percent is losing share. A company growing at 4 percent in a shrinking market is taking share. The market context often matters more than the absolute rate.

5. Mixing accounting standards. Revenue recognition rules, acquisition accounting, and foreign currency translation can all distort reported growth. Before comparing two companies' growth rates, confirm they are computed on a like-for-like basis, constant currency, organic only, and under the same accounting regime.

Frequently Asked Questions

Q: What is revenue and earnings growth in simple terms? Revenue growth is the percentage rise in sales from one period to the next. Earnings growth is the percentage rise in net income or EPS. Revenue growth tells you whether the business is getting bigger; the gap between the two tells you whether it is getting more or less profitable.

Q: How do revenue and earnings growth affect investment decisions? Investors decompose EPS growth into its sources: real commercial expansion, margin improvement, or buyback-driven share reduction. Only the first two reflect business momentum; the third has a ceiling set by cash generation.

Q: What is a real-world example of revenue and earnings growth? Two companies both grow EPS 12%, but Company A grows revenue 12% with stable margins while Company B has flat revenue and used margin expansion plus buybacks. Same growth rate, very different businesses, and Company B's path cannot continue indefinitely.

Q: How can investors use revenue and earnings growth practically? Separate organic revenue growth from acquired revenue. As a rule of thumb, if more than a third of reported top-line growth comes from acquisitions, the underlying business may be growing much more slowly than the headline suggests.

Q: How is earnings growth different from CAGR? CAGR is the annualized rate connecting two endpoints for any metric. Earnings growth typically refers to year-over-year EPS change or the CAGR of EPS. The important distinction is that EPS growth can be achieved by shrinking the denominator (shares outstanding) rather than growing net income, which CAGR alone cannot reveal.

Sources

1. Damodaran, A. "The Fundamental Determinants of Growth." NYU Stern. https://pages.stern.nyu.edu/~adamodar/New_Home_Page/valquestions/growth.htm
2. Damodaran, A. "Estimating Growth." Valuation course slides, NYU Stern. https://pages.stern.nyu.edu/~adamodar/podcasts/valspr21/session9slides.pdf
3. McKinsey & Company. "How Share Repurchases Boost Earnings Without Improving Returns." https://www.mckinsey.com/capabilities/strategy-and-corporate-finance/our-insights/how-share-repurchases-boost-earnings-without-improving-returns
4. Robeco. "Decomposing Equity Returns: Earnings Growth Versus Multiple Expansion." https://www.robeco.com/en-us/insights/2025/02/decomposing-equity-returns-earnings-growth-versus-multiple-expansion

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.