What index construction choices do I need to understand for CFA?

Question

AcadiFi · Accepted Answer

Index construction involves six decisions that shape behavior: (1) the target market (broad-cap, mid-cap, sector, region); (2) security selection rules (rules-based vs committee); (3) weighting scheme (price-weighted, market-cap-weighted, equal-weighted, fundamental-weighted); (4) free-float adjustment (total shares vs publicly tradable shares); (5) rebalancing frequency (quarterly, semi-annual, annual); (6) reconstitution rules (adding/removing constituents). Each choice has performance and tracking consequences. Example: The S&P 500 is cap-weighted, free-float adjusted, committee-selected, and rebalanced quarterly. The Dow Jones Industrial Average is price-weighted, committee-selected, 30 names. The Russell 3000 is rules-based cap-weighted reconstituted annually in June. MSCI World rebalances semi-annually and free-float adjusts aggressively. The consequences: a cap-weighted index tilts toward large, well-performing names (momentum bias); equal-weighted tilts toward small caps; price-weighted tilts toward high-priced stocks regardless of company size; fundamental-weighted mutes bubbles by weighting on book value or sales. Turnover and thus transaction costs rise with more frequent rebalancing and rules-based reconstitution. As an analyst or PM, always confirm your benchmark matches your investment universe and style, or you'll generate mechanical tracking error.

```mermaid
flowchart LR
A[Index Design] --> B[Selection]
A --> C[Weighting]
A --> D[Rebalance]
C --> E[Price]
C --> F[Cap]
C --> G[Equal]
```

What index construction choices do I need to understand for CFA?

Master Level II with our CFA Course

Related Questions

Practice Questions