Value Return Decomposition
Separate value returns into growth, income, rebalancing, and valuation change
- Difficulty
- Advanced
- Time to result
- ~weeks to results
- Steps
- 6
- Confidence
- 98%
Analyze value as a dynamic strategy rather than a permanent collection of slow-growing companies. Decompose its relative return into four mechanisms: fundamental growth, income, the effect of regularly refreshing the cheap-stock portfolio, and changes in the valuation discount between value and growth. Value companies normally grow more slowly, partly because they distribute more earnings, so lower growth must be considered alongside higher income. Rebalancing can add return by selling securities after they cease to be cheap and replacing them with newly discounted securities. Finally, isolate repricing: a widening value discount can overwhelm the other positive components for years, making a viable process appear broken. Because valuation gaps cannot widen indefinitely, test what returns would look like if the spread merely stopped changing. This distinguishes persistent economic mechanisms from a temporary, non-repeatable valuation headwind.
Origin
Ben Inker presented GMO's decomposition of value's post-2007 underperformance on Masters in Business.
Core principles
- 01Headline performance does not reveal why a strategy won or lost
- 02Slow growth can be offset by income and disciplined rebalancing
- 03Value is a refreshed portfolio rather than a static basket
- 04Relative valuation change is powerful but cannot move one way forever
- 05A strategy can remain structurally sound during prolonged underperformance
How to run it
- 1
Define the comparison
Specify the value portfolio, benchmark, period, and relative-return measure. Ensure the portfolio's refresh rules are represented accurately.
Pro tip Use consistent definitions across the full history.
Watch out Changing the value definition after seeing results creates hindsight bias.
- 2
Measure relative growth
Calculate how the earnings or fundamentals of value holdings grew relative to the market or growth portfolio.
Pro tip Expect value to undergrow and assess the magnitude rather than treating any shortfall as failure.
Watch out Do not equate slower growth automatically with a value trap.
- 3
Add relative income
Measure dividends, distributions, or other income received above or below the benchmark.
Pro tip Connect slower retained growth to higher shareholder payouts where appropriate.
Watch out Ignoring income systematically understates the value proposition.
- 4
Measure the refresh effect
Attribute the return generated by selling securities that no longer qualify and purchasing newly cheap securities.
Pro tip Model the actual rebalance schedule and transaction rules.
Watch out A static basket cannot reveal the return mechanism of a refreshed value strategy.
- 5
Isolate valuation change
Calculate how much return came from the value discount widening or narrowing during the period.
Pro tip Express the effect as an annualized contribution for easy comparison.
Watch out Do not assume a historical widening or narrowing will continue forever.
- 6
Run the stable-gap test
Recalculate prospective performance with the relative valuation gap held constant. If value wins under that condition, the underlying effect may remain intact despite recent losses.
Pro tip Also test partial normalization without requiring a return to the historical average.
Watch out A stable-gap test supports diagnosis, not precise timing of a reversal.
In the wild
Value trails the broad market by roughly one and a half percentage points annually. Attribution shows that relative valuation change cost about two points a year, while income, rebalancing, and other effects offset part of that drag. The diagnosis is not that every cheap company failed fundamentally; the widening discount more than explains the shortfall. Holding the valuation gap stable in a forward test allows the positive components to re-emerge.
→ The investor distinguishes a valuation headwind from the failure of value's underlying return mechanisms.
Common mistakes
Reading only headline returns
A strategy's total underperformance does not show whether fundamentals, income, rebalancing, or valuation changes caused it.
Treating value as a static basket
Value portfolios refresh as prices and fundamentals change, so ignoring turnover removes a central source of return.
Extrapolating spread widening forever
Assuming relative valuations can move indefinitely in one direction produces increasingly absurd implied prices.
Is it for you?
Best for
It is best for factor investors, portfolio managers, and committees diagnosing a long period of disappointing relative performance.
Not ideal for
It is not ideal for evaluating a static buy-and-hold portfolio that never refreshes its holdings.
From the transcript
“value isn't a static strategy.”
“the rebalancing effect always accrues in favor of value and helps make up for the fact that the value stocks undergrow.”
“We just need this pattern to stop.”
From the episode
Ben Inker on Value and Asset Allocation (Podcast)
Ben Inker