The Economic Question
What must the company achieve for today’s price to deliver the market’s required return? A reverse DCF shifts the debate away from “my target price versus yours” and toward observable operating expectations. It is most valuable when conventional forecasts differ only slightly but valuation outputs diverge widely.First-Principles Derivation
Hold WACC, tax, reinvestment and terminal economics constant. Solve for the revenue growth or operating margin that makes model value equal current price. Then repeat for alternative assumptions, one at a time.Implied growth = the g such that model value(g, other independent assumptions) = current price
Expectation gap = independently supported driver − price-implied driver
The solution is a boundary, not a prediction.
Model Mechanics
Mauboussin’s expectations infrastructure links broad value triggers to measurable operating drivers.
The analyst selects the driver with the greatest influence and the clearest evidence, then defines a high and low range. The reverse DCF identifies how much of that range is already in the price.
A Worked Case
A stock at 100.0 implies five-year revenue growth of 12.0% when year-five margin is held at 18.0%. Independent evidence supports 9.0% to 13.0%. The price therefore sits inside the operating corridor. If the stock rises to 140.0 while everything else is unchanged, and implied growth moves to 18.0%, the investment question changes. The business may still be excellent, but the price now requires an outcome beyond the independently supported range.Interpretation Note
Price-implied growth is a benchmark for comparison with an independently developed operating forecast. Assess the implied path against industry economics, company evidence and financing capacity.
How to Assess the Result
Solve for growth, margin and duration separately. If all three require heroic assumptions at the same time, the valuation risk is greater than any single solve suggests. Translate the implied growth into market share, customers, units or capacity, so the result can be compared with a real market.When to Reassess
The implied driver cannot be reconciled to the addressable market, competitive structure, unit economics or financing capacity. Or a small change in WACC produces an implausibly large change in the solved operating boundary.How Parallax Applies This
Parallax displays the independent driver assumptions beside the price-implied growth and margin boundaries. The reverse DCF can challenge an intrinsic range and explain the current price. It cannot establish intrinsic value, crown a method, or convert market consensus into operating fact.Relative Valuation
How the market prices companies with related economics.
Reconciling Evidence
Assigning each method its role when the methods disagree.