Opportunity-Cost Scorekeeping
Track rejected alternatives so comfort has a visible long-term price
- Difficulty
- Moderate
- Time to result
- ~ongoing to results
- Steps
- 5
- Confidence
- 94%
Opportunity-Cost Scorekeeping expands a decision journal beyond what the investor actually bought or sold. At each consequential choice, the investor records the selected action, realistic alternatives, the intended horizon, and the reasoning available at the time. Every path is then tracked on a comparable basis, including reinvested income, fees, and risk. Periodic reviews compare what happened with what credible alternatives would have produced. This makes the price of comfort visible: avoiding a temporary drawdown may feel successful while creating a much larger long-term return gap. The framework is not an invitation to maximize risk or criticize every losing decision through hindsight. Its purpose is to reveal recurring behavioral patterns and improve future choices while respecting liquidity needs and the original horizon.
Origin
Extracted from Masters in Business, where Fran Kinniry said he wished he had tracked investment opportunity costs earlier in his career.
Core principles
- 01Judge decisions against credible alternatives, not outcomes alone
- 02Record the cost of inaction as well as the cost of action
- 03Match short-term volatility to the actual investment horizon
- 04Treat emotional comfort as a benefit with a measurable price
- 05Review decisions over the period for which they were made
How to run it
- 1
Log the Decision
Record the date, portfolio state, chosen action, evidence, emotions, and intended time horizon. Write the rationale before the outcome is known.
Pro tip Use a standard template so entries remain comparable.
Watch out A retrospective rationale will be distorted by hindsight.
- 2
Define Credible Alternatives
List only actions the investor could realistically have taken, such as staying invested, rebalancing, buying bonds, or holding cash. Specify exact allocations or instruments.
Pro tip Include inaction as an explicit alternative.
Watch out Do not compare the decision with an impossible perfect-timing scenario.
- 3
Track Every Path
Measure the chosen path and alternatives using consistent dates, fees, income, and cash flows. Continue for the horizon stated in the original decision.
Pro tip Automate monthly price and return updates where possible.
Watch out Stopping the comparison after a convenient interval can manufacture a preferred conclusion.
- 4
Price the Comfort
Calculate the cumulative return difference and note the volatility, drawdown, and anxiety avoided by the safer choice. Treat comfort as a real benefit whose cost should be explicit.
Pro tip Review both financial and behavioral outcomes rather than returns alone.
Watch out A higher-return alternative may still have been unsuitable for genuine liquidity needs.
- 5
Extract a Decision Rule
Look for repeated gaps caused by market timing, excess cash, panic selling, or unnecessary conservatism. Convert the pattern into a rule for future decisions.
Pro tip Use multiple observations before changing policy.
Watch out One lucky or unlucky outcome is not enough to prove a rule.
In the wild
An investor moves equities to cash during a sharp decline. The journal tracks the cash position, staying invested, and a disciplined rebalance for the investor’s original ten-year horizon. Annual reviews reveal both the drawdown avoided and the recovery missed.
→ The investor can judge whether temporary comfort justified the cumulative return gap.
A long-horizon investor shifts a large allocation into low-yield bonds because stocks feel expensive. The scorecard tracks that portfolio against the unchanged strategic allocation and records volatility alongside compounded returns.
→ The hidden opportunity cost of defensive positioning becomes measurable rather than anecdotal.
Common mistakes
Using Perfect Hindsight
Comparing a real decision with the best asset chosen retrospectively creates an unfair and useless benchmark.
Ignoring Risk and Liquidity
Return differences alone do not capture whether an alternative was tolerable or suitable at the time.
Ending the Measurement Early
Evaluating a long-horizon decision after a short period can reward comfort or risk by chance rather than reveal its true cost.
Is it for you?
Best for
It is best for long-term investors and advisers who repeatedly make allocation or market-timing decisions.
Not ideal for
It is not ideal for judging decisions solely by hindsight without considering information available at the time.
From the transcript
“we we often only judge what we did, yet we don't judge what we could have done.”
“we pay a huge opportunity cost for comfort if you have a thirty year horizon or a twenty year horizon.”
“just do it with eyes wide open on what the opportunity cost you are creating for the comfort of short term volatility.”
From the episode
Fran Kinniry on Private Equity Portfolio Investments (Podcast)
Fran Kinniry