Scenario Analysis for Portfolio Strategy

Ask what the portfolio would experience

Scenario analysis asks how a portfolio might respond if its economic backdrop changes, not what the next market move will be. A growth shock, inflation shock, and rate shock can affect equity, credit, commodity, and currency exposures through different channels; label the assumed shock before interpreting a portfolio response.

Write down the starting holdings, weights, valuation date, and measurement horizon. A scenario that changes several inputs at once can be useful for exploring vulnerabilities, but it cannot identify which assumption drove the result unless each input is visible.

Build a coherent shock rather than a forecast

Choose a small set of linked assumptions and make them explicit. For example, an inflation surprise could be paired with a rate response as a hypothetical exercise, while a separate version holds rates unchanged to test sensitivity. Neither version assigns a probability or predicts a policy decision.

The scenario should state whether the values are illustrative, historical, or drawn from a defined model. If the source data or mapping is unavailable, keep the shock qualitative instead of manufacturing precise portfolio losses.

• Starting portfolio and date of the holdings snapshot
• Growth, inflation, and rate assumptions changed in each case
• Equity, credit, commodity, or FX exposures affected by the shock
• Model limits, omitted dependencies, and any unpriced liquidity effects

Trace the channels into combined holdings

A security can appear in several funds, and an indirect exposure may matter alongside a direct position. Look through holdings where reliable data permit, then note any gaps rather than assuming the portfolio contains only the visible line items.

Market prices, correlations, and available liquidity can behave differently under stress than in a calm-period estimate. Keep those effects as explicit uncertainties; a scenario worksheet is not proof that diversification or a hedge will work as modeled.

Use the comparison to find questions

Compare the portfolio response across scenarios to identify which assumptions matter most, which exposures dominate the result, and what evidence would improve the analysis. A large modeled change is a prompt to inspect inputs, not by itself a reason to buy, sell, or rebalance.

Save the assumptions with the output so a later review can distinguish a changed portfolio from a changed model. Sensitivity to these shocks describes the portfolio under chosen inputs; it says nothing by itself about their likelihood.