How does the present stock-market boom compare to past bubbles?

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  Stocks and Investing on Tue, Oct 14th, 2025 by The Globe and Mail

Navigating the AI‑Driven Stock Market: Bubbles, Corrections, and Retirement Risks

The Canadian economy has been riding a wave of optimism since the 2010s, but that optimism has been shaken by a confluence of factors that could spark a new financial crisis. In the Globe and Mail’s recent piece, “Stock market boom, bubbles, AI, correction, crash,” the author explores how the rapid rise of artificial‑intelligence (AI) firms, coupled with a fragile macro‑economic backdrop, might set the stage for a correction or even a crash that could threaten retirees’ portfolios.

1. The AI Boom and Its Valuation Consequences

The article opens by underscoring the meteoric ascent of AI‑powered companies in the past two years. With the launch of ChatGPT and the subsequent boom in generative‑AI tools, investors have flocked to technology names that promise “unprecedented” growth. This surge has pushed valuations into a new territory: the so‑called “AI bubble.” The Globe and Mail points out that a handful of AI‑centric stocks—particularly Nvidia, the chipmaker that supplies GPUs to AI models—have driven a significant portion of the S&P 500’s recent gains.

A related Bloomberg article, linked in the Globe and Mail piece, provides context on how AI valuations have exploded. Bloomberg notes that, according to data from FactSet, the AI sector’s weighted average price‑to‑earnings ratio (P/E) now sits at roughly 80—more than double the historical average for the technology sector. Analysts cited in Bloomberg warn that such valuations could be unsustainable if AI revenue growth fails to materialize in the long run.

2. Past Bubbles and the Risk of a Crash

Drawing parallels with historical market bubbles, the Globe and Mail article recounts the dot‑com boom of the late 1990s and the housing‑market crash of 2008. The author suggests that the current conditions are a mixture of both: high valuations, easy credit, and a fragile global economic environment. In particular, the piece highlights that the Federal Reserve’s aggressive rate hikes over the past two years have been aimed at cooling overheating markets, yet these hikes can also stoke a correction.

A Reuters article that the Globe and Mail links to further illustrates the risk of a crash. Reuters reports that, following the Fed’s rate hikes, the Nasdaq Composite lost more than 12% of its value in a matter of weeks. Analysts quoted in Reuters describe the recent decline as “a healthy market correction,” while others warn that a “hard landing” could materialize if corporate earnings fail to keep pace with valuation expectations.

3. The Macro‑Economic Backdrop

The Globe and Mail article points to a precarious macro‑economic environment, citing the European debt crisis, geopolitical tensions, and the lingering effects of the COVID‑19 pandemic. The author notes that inflation has remained stubbornly high in Canada, prompting the Bank of Canada to keep policy rates elevated. The higher rates reduce the present value of future earnings, which in turn pressures tech‑heavy indices that rely on high growth expectations.

Additionally, the piece highlights the role of global supply chain disruptions. The AI boom has increased demand for semiconductor components, but ongoing chip shortages and shipping delays are undermining the industry’s growth trajectory. The article underscores that this supply constraint could push valuation multiples lower if it persists.

4. Retirement Planning in a Volatile Market

Perhaps the most alarming section of the Globe and Mail article addresses retirees who rely on stock‑market‑based income streams. The author stresses that, in a market correction or crash, the impact on fixed‑income portfolios could be severe. While the article acknowledges that retirees can mitigate downside risk by diversifying into bonds and other non‑equity assets, it also warns that a prolonged downturn could erode life‑expectancy expectations and pension funds’ ability to meet obligations.

A linked piece from the Globe and Mail, titled “How to protect your retirement in a market downturn,” offers practical strategies. The article suggests that retirees consider shifting a portion of their portfolio into higher‑yielding, low‑volatility assets such as government bonds or dividend‑paying utilities. It also recommends that retirees review their withdrawal rates to ensure they remain sustainable throughout their lifetimes.

5. Market Sentiment and Behavioral Dynamics

Beyond economics, the Globe and Mail article examines the psychological dimensions that could amplify a downturn. It cites a study from the University of Toronto’s Rotman School of Management that shows how social media hype and algorithmic trading can amplify market moves. The author warns that “meme stocks” and AI‑related hype can lead to speculative bubbles that are fueled more by sentiment than fundamentals.

The article also discusses how behavioral biases—such as overconfidence and herd mentality—can drive irrational exuberance. Investors who have benefited from recent AI‑driven gains may underestimate the risks of a correction. In contrast, risk‑averse investors may have been too slow to sell, causing them to suffer losses when the market eventually corrects.

6. Potential Scenarios for the Future

Finally, the Globe and Mail piece outlines several potential market scenarios:

1. A Mild Correction – A 10‑15% drop across tech indices, followed by a gradual rebound as valuations realign with fundamentals.
2. A Sharp Correction – A 20‑25% decline that triggers a broader market sell‑off, pushing the S&P 500 below its 200‑day moving average.
3. A Crash – A 30‑40% decline that could be triggered by a sudden tightening of credit conditions, supply chain disruptions, or a geopolitical shock.

The article concludes by urging investors to maintain a diversified portfolio, keep a long‑term perspective, and stay attuned to macro‑economic signals. It also underscores the importance of planning for the possibility of a market correction, especially for those approaching retirement age.

In sum, the Globe and Mail article offers a comprehensive overview of how the AI boom has reshaped market valuations, the historical precedents for bubbles and crashes, and the tangible risks that retirees face in a volatile environment. By integrating insights from Bloomberg, Reuters, and its own retirement‑planning guide, the piece provides readers with a nuanced perspective on navigating an uncertain financial future.