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Are We in an AI Bubble? 

Investor enthusiasm for AI is reminiscent of the Internet boom circa 1995. Having worked at Google, I’ve seen AI’s profound impact firsthand, from computer vision to self-driving Waymo vehicles that have achieved 10M rides. But as an investor, the focus must shift to economics: business models, monetization, and valuation. Billionaires like David Einhorn are sounding the alarm: spending hundreds of billions on AI infrastructure may lead to massive capital destruction if CapEx vastly exceeds consumption. History shows that while the technology transforms society, an oversupply creates painful market corrections. The question isn’t if AI is the future—it’s what price you pay for it.

Jay Powell: “Stocks are Overvalued”

The current market presents a stark contradiction: stocks are high, but the Fed is entering an easing cycle. As billionaire David Tepper notes, he’s “constructive on stocks” due to cheapening money but “miserable” because valuations are sky-high. Warren Buffett mirrors this caution, holding a record high of over $344 billion in cash. This balance reflects the core tension: stocks can easily run higher on investor optimism, yet the consensus is that forward earnings multiples are dangerously stretched. Like Buffett in 1969 and 1997, savvy long-term investors are prioritizing capital preservation, maintaining some exposure while waiting for the inevitable mean reversion to bring prices back down to a prudent level.

Tepper: “Nothing is Cheap Anymore”

Long-term investing demands a careful balance: stocks typically rally on the promise of cheaper money from expected rate cuts, but this momentum clashes with clear structural economic weakness that necessitates the cuts. History favors stocks during easing cycles. However, the key risk lies in whether economic weakness persists and hammers corporate earnings, eventually undermining high valuations. The recent “hawkish cut” by the Fed surprised markets, indicating concern for a deteriorating jobs picture over inflation. While the market continues to rally on optimism, as legendary investor David Tepper warns, valuations are high. The strategy remains to maintain equity exposure to ride the easing cycle while holding significant cash to capitalize on any likely drawdown.

Recession or Weakening? 

Despite signs of a weakening U.S. labor market, including a recent record-downward revision to job growth figures, investor bullishness remains at record highs. However, it’s pure optimism that has pushed stock market valuations to expensive levels, with the S&P 500 trading at over 22 times forward earnings. While market psychology and momentum can drive prices in the short term, fundamentals will eventually prevail. Prudent investors should prioritize buying high-quality companies at attractive valuations, a strategy that currently requires patience.

For a full list of posts from 2017…