Which change is investment performance and which is an external contribution? This original fictional exercise focuses on reconciling returns with external cash-flow timing. The task is to build a return-and-cash-flow reconciliation, not copy a confident conclusion. It is not a live recommendation, client record or employer assessment.
The inputs and the question
Performance analysis depends on valuation and cash-flow conventions. This guide practices a two-subperiod time-weighted calculation. It does not certify GIPS compliance or assert that a simplified exercise meets a firm’s reporting requirements.
| Supplied item | Fictional input |
|---|---|
| Opening value | 100 |
| Value before contribution | 110 |
| Contribution at the boundary | 50 |
| New subperiod opening and closing values | 160 and 168 |
Use the supplied inputs together. When dates, units or definitions are not given, identify the gap rather than silently filling it with a convenient assumption. An actual assignment may require more detail than this deliberately limited case.
Work through the base case
First subperiod return is 110/100 − 1 = 10%. After the contribution, the second return is 168/160 − 1 = 5%. Linking them gives 1.10 × 1.05 − 1 = 15.5% over the combined period.
The contribution is external cash, not a gain. State valuation timing and any fees or missing flows. The 15.5% is the combined-period result; annualization requires a known duration and convention.
The arithmetic or evidence check is only one part of the answer. Explain the definition that makes it valid and what remains outside the exercise. Do not convert a result from this case into a claim about a real company, market or client.
Change the assumption and follow the consequence
Dividing net ending change after the contribution by the original 100 gives (168 − 100 − 50)/100 = 18%. That shortcut does not implement the stated time-weighted method.
Keep the unchanged inputs visible. State whether the change is an observed fact or a scenario you introduced. If the information needed to calculate a fuller result is missing, say what you would request instead of manufacturing precision.
The interpretation to avoid
Treating a contribution as profit, averaging the two returns or labeling a combined-period return annual without dates creates a different measure.
A useful response names the limitation without abandoning the task. Show the part you can establish, then explain the condition or document needed for the next conclusion. Being explicit about that boundary is different from refusing to reason about the case.
Build the evidence artifact
Prepare a valuation/flow timeline, subperiod reconciliation and method note. Identify the appropriate reporting policy before choosing a production calculation.
Answer these questions before presenting it:
- Is each valuation immediately before or after the external flow?
- Are fees, currencies and distributions included consistently?
- What period and reporting method does the mandate require?
For your own practice, write the supplied facts, your method, the base result, the changed assumption and one unresolved question on a single page. Label professional work, public-data projects and fictional exercises accurately. Remove confidential data and do not use the example to imply a decision you did not own.
What to use next
Use the investment performance analyst preparation guide to connect the exercise to a readiness and next-resource decision. Compare the adjacent preparation task if your gap is different. The primary-source background supplies concept or role context; the facts and worked exercise above are original and fictional.
This example illustrates one method; it does not certify performance reporting or an investment manager. Inspect scope before choosing support. A readable and reproducible explanation is the immediate objective; this case does not promise an interview, qualification, investment result or a particular search ranking.