The founder of the well-known short-selling firm Muddy Waters, Carson Block, warned that artificial intelligence is fundamentally changing his judgment of the market, shifting his overall outlook from bullish to bearish. He predicts that 15% of knowledge worker jobs in the U.S. will disappear in the next three years, and the resulting wave of unemployment could create systemic shocks to the stock market.
According to Bloomberg on Thursday, Block stated at the Future Proof Wealth Management Conference in Miami Beach that just a month ago, he was completely optimistic about the S&amp;P 500 and the overall economy, but his views have now &#34;180 degrees turned.&#34; This reversal of stance came quite suddenly—just at the end of November last year, he publicly expressed a preference for being long rather than short on the U.S. market and disclosed several unconventional long positions.
Block's core concern is that the AI-driven employment shock will transmit through the labor market to the financial markets. Once rising unemployment compresses the inflow of funds into retirement accounts like 401(k) s, or even forces unemployed workers to tap into their savings early, the stock market will face sustained outflow pressure, at which point &#34;no one will be there to catch the falling knife.&#34;
<h2>Legal, Accounting, and Financial Support Positions Hit First</h2>
Block expects that job replacement due to AI will first appear in fields such as legal, accounting, tax consulting, and financial support, particularly concentrated in junior and administrative positions. In the hedge fund industry, he believes that many operational and back-office functions, including IT jobs, could be replaced by cheaper and more efficient automated systems.
He pointed out that while profitable large institutions may continue to recruit junior analysts out of habit, companies with thinner profit margins will quickly turn to automation. This divergence means that the pressure on the job market will primarily manifest in small and medium-sized enterprises and industries with lower profit margins.
Block's judgment resonates with the current mainstream anxiety in the market—investors are increasingly worried about whether the hundreds of billions of dollars invested in AI infrastructure will yield sufficient returns or merely accelerate the disruption of corporate structures and massively eliminate white-collar jobs.
<h2>Shorting Credit Spreads, Seeking Convexity Opportunities</h2>
Despite the overall shift to a bearish outlook, Block stated that his team is looking for structural opportunities in the market. Currently, Muddy Waters has established positions betting on widening credit spreads and is attempting to profit from liquidity mismatches present in some exchange-traded funds.
&#34;I think credit spreads are ridiculously tight right now, and credit volatility is also absurdly low,&#34; he said. &#34;In my view, you need convexity, and there are many ways to position yourself while controlling for maximum loss.&#34;
This strategy reflects Block's judgment that current market pricing is overly optimistic—he believes that investors, having been in a low-interest-rate environment for a long time, have developed excessive tolerance for risk and have indulged aggressive behavior at the corporate level.
<h2>A Flood of Gray Areas, but the Market No Longer Cares</h2>
Block also discussed the dilemmas facing his core short-selling business. He believes that years of loose monetary policy have not only inflated asset prices but also fostered aggressive tendencies in corporate accounting practices and information disclosure, creating a widespread &#34;gray area.&#34;
However, the market's tolerance for such behavior is increasing. &#34;My business is becoming increasingly difficult because people simply don't care unless it's something very, very excessive,&#34; he said. This means that even with a large number of companies that have potential issues, short-selling institutions find it difficult to gain sufficient resonance and returns in the market.
Risk Warning and Disclaimer
The market has risks, and investment should be cautious. This article does not constitute personal investment advice and does not take into account the specific investment goals, financial situation, or needs of individual users. Users should consider whether any opinions, views, or conclusions in this article are suitable for their specific circumstances. Investing based on this is at one's own risk

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Carson Block, the founder of the well-known short-selling firm Muddy Waters, warned that artificial intelligence could lead to the disappearance of 15% of knowledge worker jobs in the United States within the next three years, triggering a wave of unemployment and causing systemic shocks to the stock market. His outlook has shifted from optimistic a month ago to bearish, expressing concerns that AI-driven job impacts will affect the inflow of funds into retirement accounts like 401(k) s, resulting in sustained outflow pressure on the stock market. Block believes that entry-level positions in fields such as law, accounting, and financial support will be the first to be affected. Despite his bearish stance, his team is still looking for structural opportunities in the market

- Carson Block, founder of Muddy Waters, warns that AI is fundamentally altering his market outlook, shifting from bullish to bearish.  
- He predicts that 15% of U.S. knowledge worker jobs may vanish within three years, potentially causing a systemic impact on the stock market due to rising unemployment and reduced retirement account inflows.  
- Block's concerns primarily focus on the initial job losses in sectors like law and accounting, while he suggests that smaller firms and low-margin industries will feel the pressure first.

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Muddy Waters founder turns bearish: If AI continues to replace white-collar workers, the US stock market 401K system may collapse