How to Value Growth

Many investors conflate "growing" with "valuable." A company growing 20% annually sounds attractive until you ask: "At what cost?" A pharmaceutical company losing market share but cutting costs might be a better investment than a cloud software company burning cash for growth. Growth is valuable only if it happens at returns above your cost of capital. Everything else is expensive.

Quick definition: Growth premium is the additional value you assign to a business above its base earnings power, justified by above-cost-of-capital reinvestment. Growth worth $0 means earnings will remain flat forever; growth worth 50% of valuation means you're betting on sustained above-market returns.

Key Takeaways

• Growth is only valuable if reinvested earnings generate returns above your cost of capital
• The higher your cost of capital, the lower the value of any given growth rate
• Growth quality varies: sustainable high-ROIC growth is rare and expensive; declining growth is easy to find cheap
• Most DCF models embed far more growth than the business will actually deliver
• Separating base value from growth value forces intellectual honesty
• The cheapest growth is often where nobody's looking

The Math of Growth Value

Start with the PEG ratio framework, familiar to many investors:

PEG = P/E Ratio / Expected Annual Growth Rate

A stock trading at a P/E of 15 with 20% expected earnings growth has a PEG of 0.75. A stock trading at a P/E of 15 with only 5% growth has a PEG of 3.0. All else equal, the first is "cheaper" because you're paying less for each unit of growth.

But this hides a critical assumption: the growth rate is sustainable and earned at returns above your cost of capital.

The Return on Incremental Invested Capital (ROIC) Framework

The only growth that matters is growth reinvested at high returns:

Value of Growth = Incremental Profit × (ROIC - Cost of Capital) / Cost of Capital

If a business reinvests $100M in incremental capital and earns an 8% return on that capital, and your cost of capital is 6%, the value of that growth is:

Value = $100M × (0.08 - 0.06) / 0.06 = $33M

If instead the reinvested capital earns 15% while your cost of capital is 6%:

Value = $100M × (0.15 - 0.06) / 0.06 = $150M

Same growth in absolute dollars; wildly different values based on returns. This is why Amazon—reinvesting at 30% returns—justified growth valuations while other tech companies reinvesting at 5% returns were wealth-destroying.

Identifying Sustainable Growth

What growth rate can this business sustain indefinitely?

This question separates cheap growth from expensive growth:

• A utility growing 3% annually because of population growth and pricing power: sustainable indefinitely, low risk
• A financial services company growing 8% through market share gains: sustainable for 5–10 years, moderate risk
• A software company growing 50% by burning cash on customer acquisition: sustainable only if unit economics improve or growth slows

The gap between current growth and sustainable growth is often where value lives. A company growing 15% that can sustain only 6% is overvalued. A company growing 6% that can sustain 12% is undervalued.

The Three-Stage Model for Valuing Growth

A more practical approach than perpetual DCF:

Stage 1 (Years 1–5): Explicit High Growth Model each year of high-growth reinvestment. A cloud software company with 30% growth might reinvest at 20% incremental ROIC for five years.

Stage 2 (Years 6–10): Transitional Growth Growth slows as the business matures. Model a gradual decline from 30% to 10%, with ROIC also declining.

Stage 3 (Terminal): Sustainable Growth The business reaches steady state. Growth equals market growth (2–4%), and ROIC equals cost of capital or slightly above.

Value = Stage 1 + Stage 2 + Stage 3

This approach forces you to articulate: "For how long can this company grow faster than the economy? What happens when competitors catch up?"

Separating Growth Value from Base Value

Return to the two-tier valuation model:

Total Value = EPV + Growth Premium

A mature software business earning $100M annually with a 8% cost of capital has an EPV of $1,250M. If you believe it will grow 10% for 10 years and then 3% perpetually, calculate the value of that growth separately.

The growth years would add perhaps $300M to the valuation (heavily discounted). Now you ask: "Is paying $1,550M justified by my confidence that this business will grow 10% for a decade?" That's an explicit bet with a clear payoff and risk.

Compare this to a DCF model that buries the same growth assumption in a terminal value calculation, making the assumption invisible.

When Growth is Cheap

Value investors hunt for businesses where growth is underpriced:

• Unpopular industries: A 15% annual growth company in an "boring" industry trades at a lower multiple than a 12% growth company in a "hot" industry
• Contested markets: Growth in a competitive industry is cheaper than growth in a monopoly because investors discount sustainability
• Transition years: A business passing through a bad year (market cycle, restructuring, product transition) may have low valuations despite strong growth ahead
• Hidden growth: A company with market-leading position but no analyst coverage might have organic growth of 8–12% that nobody's pricing in

When Growth is Expensive

Conversely, some growth is priced for perfection:

• Venture-backed models: Companies burning cash for growth have embedded the assumption that they'll reach profitability; any slowdown is catastrophic
• Extrapolated winners: A 30% annual growth company will eventually slow (math guarantees it); if the market prices as if it won't, you're overpaying
• Cyclical growth: A company in the early innings of a cycle is "growing fast," but growth will naturally slow as the cycle matures
• Unproven growth: A business with one or two years of 40% growth might be a fluke, not a pattern

Quality of Growth: Organic vs. Acquired

Not all growth is equal:

Organic Growth (internal): A company that grows 15% from market expansion, new products, and market share gains is building real competitive advantages. This growth compounds customer relationships and brand strength.

Acquired Growth (M&A): A company that grows 15% by buying competitors at 2x revenue multiples and cutting overhead is creating financial engineering, not sustainable value. When the acquisition taps dry, growth stops.

The best growth is organic, self-funded, and earned at high ROIC. The worst is acquired, debt-financed, and requires constant deal-making.

Discount Rate and Growth Value

The relationship is inverse and nonlinear:

At a 5% cost of capital, growth is incredibly valuable. A company reinvesting at 10% ROIC (half a point above cost) creates significant value. At a 10% cost of capital, growth becomes expensive. The same 10% ROIC reinvestment creates almost no value relative to cost of capital.

This is why rising interest rates hurt growth stocks disproportionately. The discount rate rises, making future growth worth less in today's dollars. A business worth 20x earnings at 3% rates might be worth 12x at 7% rates, all else equal.

Real-World Examples

Netflix (2010): Trading at 40x earnings with 25% annual growth. Naive extrapolation suggested $1B+ Netflix by 2020. Reality: growth slowed to 20%, then 15%, then 10% as the market matured. But the valuation was justified because Netflix reinvested growth at high ROIC and built network effects. The premium was earned.

GoPro (2015): Trading at 20x earnings with 60% growth. The assumption: exponential camera adoption forever. Reality: the market saturated in two years. Growth collapsed to 5%. The valuation was destroyed because growth didn't materialize.

McDonald's (2015): Trading at 24x earnings with 3% growth. The assumption: slow, predictable growth powered by pricing and new markets. Reality: this held true. You overpaid for certainty, but certainty has value.

Common Mistakes

Extrapolating recent growth indefinitely. A company growing 40% this year will not grow 40% in perpetuity. Market size limits force deceleration.

Confusing revenue growth with profit growth. A company growing revenue 20% while margins compress is less valuable than one growing revenue 10% while margins expand. Growth in profits (not sales) is what matters.

Ignoring reinvestment requirements. A company growing 20% but requiring 18% of revenue in reinvestment has less free cash for shareholders than one growing 15% while requiring 5% reinvestment.

Using analyst estimates without adjustment. Sell-side analysts are systematically optimistic. If consensus expects 15% growth, bet on 10%. If consensus expects 20%, assume 12%.

Assuming small markets justify high growth forever. A $50M revenue company growing 50% might sound sustainable ("We're tiny, massive TAM!"), but competing for a bigger market gets harder, not easier.

FAQ

Q: How do I estimate a sustainable growth rate? A: Cross-check three approaches: (1) historical growth rate, (2) GDP growth for the addressable market, (3) the company's stated capital allocation (dividends + buybacks + reinvestment). If all three converge on 5%, that's probably sustainable. If they spread from 3% to 15%, you have uncertainty.

Q: Should I use analyst growth estimates? A: As a starting point only. Adjust downward for optimism bias (typical adjustment: -20% to -30%). If analysts expect 15%, model 10–12%.

Q: What ROIC should I assume for reinvested capital? A: Look at historical ROIC on incremental capital. For tech, 20–30% is reasonable for quality businesses; for manufacturing, 10–15%; for finance, 12–18%. When in doubt, assume ROIC = cost of capital (growth destroys no value but creates none either).

Q: Is growth in earnings per share the same as growth in value? A: No. A company can grow EPS by issuing buyback debt while shrinking the total value of the business. Focus on growth in normalized free cash flow, not accounting earnings.

Q: When is it safe to assume 3% perpetual growth? A: When the business operates in a mature market with stable returns on capital and predictable demand. Utilities, packaged goods, and established financial services qualify. Tech, healthcare, and emerging market businesses do not.

Related Concepts

• Return on Invested Capital (ROIC): The driver of growth value; growth at low ROIC destroys value
• Terminal Value: The growth assumption that dominates DCF models and introduces the most risk
• Compounding: High growth at high ROIC over a decade creates exponential value
• Market Saturation: The ceiling that eventually stops all high growth
• Unit Economics: The microeconomic foundation that determines if growth is sustainable

Summary

Growth is valuable only when reinvested at returns above your cost of capital. Most investors pay for growth without checking whether that growth earns sufficient returns. By separating base value (EPV) from growth premium and explicitly calculating the ROIC of incremental capital, you avoid overpaying for expensive growth and identify cheap growth hiding in unloved sectors. The hardest part isn't the math; it's the humility to admit when you don't know how long a growth company's growth will last.

Next

Proceed to the next article: Bruce Greenwald's Approach to Value.