For which type of ESG activity would it be easiest to evaluate the impact on a portfolio's performance?

Question

BlackTom AI · Accepted Answer

Excluding an industrial sector (e.g., tobacco) is easiest to evaluate because it produces a clean, quantifiable change in portfolio composition that can be directly measured against a benchmark.

1) Relevant knowledge points and concepts
- Portfolio attribution: decomposing performance into sector, security selection, and other effects.
- Active return and tracking error: active return = Rp − Rb; tracking error = std(Rp − Rb).
- Data availability and measurability: sector classifications and index weights are standardized, enabling clear before/after comparisons.
- Causality and time horizon: exclusion is immediate; engagement and supply-chain screening are diffuse and long-term.

2) Step-by-step reasoning
- Step 1: Define benchmark (Rb) and construct the exclusion portfolio (Rp_excl) by removing the sector and reweighting remaining holdings.
- Step 2: Calculate periodic returns for both series and compute active return and tracking error to quantify impact.
- Step 3: Use backtesting to measure cumulative and risk-adjusted differences; these metrics are attributable to the single policy decision (the exclusion).

3) Calculation example (intermediate steps)
- Suppose annual return of benchmark Rb = 8.0% and return of exclusion portfolio Rp_excl = 7.0%.
- Active return = Rp_excl − Rb = 7.0% − 8.0% = −1.0%.
- If monthly active returns (d_i) have standard deviation σ_d = 1.8% (monthly), annualized tracking error ≈ σ_d × sqrt(12) ≈ 1.8% × 3.464 = 6.24% (illustrative).
These quantities are straightforward to compute and interpret.

4) Why the correct answer is correct
Exclusion changes the investable universe in a clearly defined way. Sector classification and weights are objective, so performance consequences can be isolated, quantified, and statistically tested.

5) Why the other options are incorrect
- Screening for exploitive labor practices: impacts are indirect, require granular supply-chain data, and effects on cash flows and risk are uncertain and delayed, making attribution difficult.
- Active engagement: outcomes depend on issuer responses, take long periods, are qualitative (policy changes), and any performance effect is hard to isolate from market movements and other policy changes.

6) Conclusion
Because exclusion yields immediate, measurable, and attributable changes in portfolio returns, the correct answer is "Excluding an industrial sector (e.g., tobacco)," which matches the provided answer.

For which type of ESG activity would it be easiest to evaluate the impact on a portfolio's performance?单项选择题

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