Passive? Not Neutral.

Passive investing didn’t just win. It changed the market itself.

The assumption:

Passive = neutral.

It’s not. It’s a structural force.

ICI data:

• Passive = ~51% of long-term fund assets

• Up from ~19% in 2010

That shift created a feedback loop:

→ Money flows into index funds

→ Allocation follows market cap

→ Largest companies get the most capital

→ Prices rise

→ Weights increase

Repeat.

Federal Reserve + BIS research shows:

• Higher passive share → higher correlation

• Lower price dispersion

• Reduced price discovery

Meaning:

Prices reflect flows more than fundamentals.

Second-order risk:

Passive assumes liquidity. But underlying assets don’t guarantee it under stress.

Conclusion:

Passive investing amplifies:

→ Concentration

→ Correlation

→ Fragility

It doesn’t just track markets. It reshapes them.

Question: At what point does “passive” stop being passive?