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Competitive Advantage Period and Fade

The competitive advantage period (CAP) is the length of time a firm can keep its ROIC above WACC before competition erodes the excess. Beyond the CAP, returns fade toward the cost of capital, and any growth becomes value-neutral. The CAP is what economic theory predicts: a positive spread attracts entrants and imitators, so abnormal returns decay unless a durable barrier defends them. In a valuation this assumption is decisive, since assuming a wide moat lasts forever quietly loads most of the value into a terminal period that competition is unlikely to spare.

Try it yourself

The value-driver formula

A firm creates value only when ROIC > WACC. With constant growth g, NOPAT and a constant ROIC, the plough-back rate is g / ROIC and the value is V = NOPAT·(1 − g/ROIC) / (WACC − g). Compare it with the no-growth value NOPAT / WACC: growth lifts the value above the benchmark only when ROIC clears the cost of capital, and drags it below when ROIC falls short.

Enterprise value V$1555.6m
$0m$1146m$2292m$3438m$4583m0%2%4%6%8%Growth rate g (%)Enterprise value V ($m)no-growth value$1555.6mV vs g (ROIC, WACC fixed)no-growth value
Reinvestment rate g/ROIC 22.2%Value spread ROIC − WACC +9.0%
NOPAT (year 1)$100m
Growth rate g4.0%
ROIC18.0%
WACC9.0%
ROIC (18.0%) clears WACC (9.0%), so each dollar reinvested earns more than it costs. Value $1555.6m sits +$444.4m above the no-growth benchmark $1111.1m: growth creates value, and faster growth creates more.
Try this

Hold g fixed and slide ROIC across WACC. Above WACC the gold curve rises with g; below it the curve turns rose and falls; exactly at WACC it lies flat on the no-growth line.

Reflect: a fast-growing firm with ROIC below its WACC is worth less than if it stopped growing entirely. Why, then, do markets sometimes reward growth for its own sake, and how long can a firm sustain ROIC above WACC before competition closes the gap?

Why it matters

A great business is not just one that earns a wide spread today, but one that can hold it. Excess returns are a magnet for rivals, so the open question in any valuation is how many years the firm can fend them off. That window is the CAP. A strong brand, network effects or patents stretch it, a commoditised product shortens it. The honest analyst fades ROIC back toward WACC over the explicit horizon rather than freezing today’s spread into perpetuity, because the steady state of competition is no excess return at all.

Formulas

Fade of the economic spread
(ROICt−WACC)→0as t→end of CAP(\mathrm{ROIC}_t - \mathrm{WACC}) \to 0 \quad \text{as } t \to \text{end of CAP}
During the CAP the spread is positive. After it, competition drives ROIC toward WACC, so incremental growth neither adds nor destroys value.
Linear fade of ROIC
ROICt=ROIC0−(ROIC0−WACC)×tN\mathrm{ROIC}_t = \mathrm{ROIC}_0 - (\mathrm{ROIC}_0 - \mathrm{WACC}) \times \dfrac{t}{N}
One simple fade pattern over NN years. At t=0t = 0 the firm earns its full spread, and at t=Nt = N, the end of the CAP, ROIC has converged to WACC.

Worked examples

Scenario

A firm earns a ROIC of 18 percent against a WACC of 10 percent, and an analyst judges the competitive advantage period to be 5 years with a linear fade. What is the spread in year 3?

Solution

The initial spread is 18 minus 10, that is 8 percentage points, fading to zero over 5 years. The annual step is 8 over 5, which is 1.6 percentage points a year. By year 3 the spread has fallen by 3 times 1.6, that is 4.8 points, leaving 8 minus 4.8, about 3.2 percentage points. ROIC in year 3 is roughly 13.2 percent. Freezing the original 8-point spread forever would have materially overvalued the firm, since the model says the advantage is half gone by year 3.

Common mistakes

  • ✗A firm with a high ROIC today will keep it indefinitely. Excess returns attract competition and tend to fade toward WACC unless a durable barrier protects them.
  • ✗A longer competitive advantage period is a neutral modelling choice. The assumed length of the CAP is one of the most powerful drivers of a valuation and must be justified by a real moat.
  • ✗Fade only matters for weak companies. Even strong franchises face fade. The question is the speed, not whether it happens at all.
  • ✗Once returns fade, growth still adds value. After ROIC reaches WACC, additional growth is value-neutral, so growth and fade assumptions have to be considered together.

Revision bullets

  • •The CAP is how long ROIC can stay above WACC
  • •After the CAP, returns fade toward the cost of capital
  • •Competition erodes abnormal returns unless a moat defends them
  • •A durable barrier lengthens the CAP, a commodity shortens it
  • •The assumed CAP length strongly drives the valuation
  • •Once ROIC reaches WACC, further growth is value-neutral

Quick check

The competitive advantage period in a valuation refers to

Assuming a very long competitive advantage period in a DCF tends to

Connected topics

WACCROIC vs WACCValue DriversManagerial MyopiaEnterprise DCF

Sources

  1. Koller, Goedhart & Wessels (2020)
    Koller, T., Goedhart, M., & Wessels, D. Valuation: Measuring and Managing the Value of Companies. 7th ed. McKinsey & Company / Wiley, 2020.
    Discusses the fade of returns on capital toward the cost of capital as competition intensifies.
  2. Mauboussin & Johnson (1997)
    Mauboussin, M. J., & Johnson, P. "Competitive Advantage Period: The Neglected Value Driver." Financial Management, 26(2), 1997, pp. 67-74.
    Introduces the competitive advantage period as a distinct and often overlooked value driver.
How to cite this page
Dr. Phil's Quant Lab. (2026). Competitive Advantage Period and Fade. Derivatives Atlas. https://phucnguyenvan.com/concept/sabv-competitive-advantage-period
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