The Rise of Passive Investment: A Blessing or a Curse?

The Rise of Passive Investment: A Blessing or a Curse?

The growing popularity of passive investment is reshaping the asset management industry and raising concerns about its impact on stock markets.

Passive investment, the practice of 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 becoming increasingly wary of its influence on the market. The latest data shows that passive funds now surpass active funds in terms of net assets, sparking debates about the implications of this shift. This article explores the rise of passive investment, its impact on the stock market, and the challenges it poses for both passive and active investors.

1: The Passive Revolution

Passive investment has witnessed a remarkable surge in popularity over the past four decades. Investors, from individual traders to institutional giants, are drawn to the ease and affordability of exchange-listed market trackers. This trend has triggered a fee war within the asset management industry, causing concern among fund managers. They argue that passive investment complicates the art of successful investing and distorts the stock market’s natural dynamics.

2: The Dominance of Passive Funds

Recent data from Morningstar reveals that passive funds have surpassed active funds in terms of net assets, marking a significant milestone. Despite weak demand for US mutual funds and exchange-traded funds in 2023, a substantial portion of the inflows favored passive funds. Morningstar highlights that passive funds have been encroaching on active funds’ territory for years, with the total assets in passive funds reaching $13.3tn, $8tn of which is invested in US equities.

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3: Dulling the Impact of News

Concerns have been raised about the sedating effect of passive investment on the stock market. A study conducted by researchers at the University of Alberta and Purdue University suggests that the increasing use of indexing has dampened the impact of news on stock movements. The researchers examined the response of stocks in the S&P 500 index, a prime target for passive investment, to currency shocks. They found a significant decrease in stocks’ idiosyncratic currency sensitivity among those included in the index compared to those that were not. This phenomenon has persisted even after controlling for currency hedging practices.

4: Challenging the Efficient Markets Hypothesis

The rise of passive investment poses a challenge to the efficient markets hypothesis, which asserts that asset prices reflect all available information. The researchers argue that increased indexing undermines the viability of this hypothesis. As passive investment continues to grow, the allocation of capital becomes disconnected from the pursuit of successful companies. Instead, it becomes a circular bet on the inflow of more money into the asset class.


Passive investment has democratized access to financial markets and generated wealth for millions of investors. However, mounting evidence suggests that it may insulate stocks from surprises and hinder their ability to reflect fundamental factors. This poses risks for both passive and active investors, as faulty capital allocations become more prevalent. As passive investment continues to reshape the asset management industry, it is crucial to consider the long-term implications and adapt investment strategies accordingly.