The Rise of Passive Investment: A Game Changer for the Stock Market

The Rise of Passive Investment: A Game Changer for the Stock Market

The increasing popularity of passive investment is reshaping the asset management industry and challenging traditional investment strategies.

Passive investment, a strategy that involves buying low-cost market trackers instead of actively managed funds, has gained significant traction in recent years. While investors appreciate its simplicity and cost-effectiveness, fund managers are concerned about its impact on the stock market and the art of successful investing. The latest data shows that passive funds have surpassed active funds in terms of net assets for the first time ever. This trend raises questions about the sedating effect on the stock market and the ability of stocks to reflect market news. A recent study suggests that the rise of passive investment undermines the efficient markets hypothesis, which has been the guiding principle for investment strategies. As passive investment continues to grow, it is changing the dynamics of the investment landscape and posing risks for both passive and active investors.

The Dominance of Passive Investment in the Asset Management Industry

Passive investment has seen a surge in popularity, with net assets in passive funds surpassing those in active funds. According to Morningstar, the demand for US mutual funds and exchange-traded funds in 2023 was relatively weak, with a net inflow of $79 billion. However, the majority of this money flowed into passive funds, which have been encroaching on active funds’ territory for years. The total assets in passive funds now stand at $13.3 trillion, with $8 trillion invested in US equities. This shift towards passive investment has been a one-way traffic over the past decade, with US equity fund flows favoring passive strategies since 2005.

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The Sedating Effect on the Stock Market

Concerns have been raised about the impact of passive investment on the stock market. A recent study by Randall Morck at the University of Alberta and M Deniz Yavuz at Purdue University suggests that the increasing use of indexing has dulled the impact of news that would typically move stocks. The researchers examined the impact of currency shocks on companies sensitive to them and compared the reaction of stocks in the S&P 500 index (a prime target for passive investment) to those outside the index. The study found a significant decrease in stocks’ idiosyncratic currency sensitivity when they were included in the S&P 500 index. This decrease in sensitivity is not limited to currency shocks but extends to other shocks as well.

Challenging the Efficient Markets Hypothesis

The rise of passive investment also challenges the efficient markets hypothesis, which posits that asset prices reflect all available information. The study suggests that increased indexing undermines the efficient markets hypothesis, as indexed stocks show lower sensitivity to shocks and fail to reflect fundamentals. This raises concerns about the allocation of capital and the ability of passive investment to reward successful companies.


While passive investment has democratized access to financial markets and generated wealth for many investors, its growing dominance raises concerns about the stock market’s ability to reflect market news and fundamentals. The sedating effect of passive investment and its impact on the efficient markets hypothesis challenge traditional investment strategies. As the popularity of passive investment continues to grow, it is essential for investors to consider the potential risks and implications for both passive and active investment approaches. The investment landscape is evolving, and investors must adapt to these changing dynamics to navigate the market successfully.

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