The Active-versus-Passive Divide Is No Longer Clean
Stein challenges the idea that indexes are inherently passive. Choosing an index, defining its rules, and deciding which companies qualify all involve active judgments, so the boundary between active and passive strategies is increasingly blurred.
- Many alternative indexes now exist.
- Selecting an index is itself a decision.
- Index inclusion rules encode active judgments.
- Algorithms cannot always be neatly classified as active or passive.
“it's very hard to tell the difference between active and passive anymore because there's so many different types of passive out there.”
“Is an active choice? Right? Like? Which index? Are we going to track what gets added and what's and what's not?”