Counter to the narrative that indexing is killing active management, Davis argues the opposite. As more capital flows into passive funds that must buy and sell indiscriminately, it creates greater market inefficiencies. This environment allows the remaining skilled active managers to more easily exploit mispricings and generate significant alpha.

A truly passive portfolio would own all global financial assets in proportion to their market value. However, this is impossible because many assets, like government-held bonds or restricted foreign stocks, are not available to public investors, making every real-world index fund an active bet.

A key flaw in pure indexing is the forced, predictable trading around index rebalancing. When a stock is added, all index funds must buy it, often at an inflated price due to front-running. David Booth estimates this systematic inefficiency costs index fund investors a "run up" of about 4% on new additions.

Index providers are no longer neutral. By changing inclusion rules to quickly add "hot" IPOs like SpaceX, they are making active bets on specific companies. This blurs the line between active and passive investing, requiring investors to have an opinion on the index's strategy itself rather than just blindly buying.

Market-cap-weighted indexes create a perverse momentum loop. As a stock's price rises, its weight in the index increases, forcing new passive capital to buy more of it at inflated prices. This mechanism is the structural opposite of a value-oriented 'buy low, sell high' discipline.

Contrary to classic theory, markets may be growing less efficient. This is driven not only by passive indexing but also by a structural shift in active management towards short-term, quantitative strategies that prioritize immediate price movements over long-term fundamental value.

By design, market capitalization-weighted indices increase allocations to assets as their prices rise. This forces investors to continuously buy more of what has already performed well, leading to concentration in popular, often expensive, assets and sectors from the previous market cycle.

Stocks that are added to an index and later removed (a "flip-flop") systematically damage returns. The index buys after a 75% run-up but sells after a 70% drop. Because the index investor missed the initial gain but participates fully in the loss, the net effect is a significant performance drag.

So-called passive indexes have a small but impactful "active side" in their turnover. This component behaves like a flawed momentum strategy, forcing the index to systematically buy stocks after they've surged and sell them after they've plummeted, creating a performance drag.