Market commentary
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The calculus of madness: Part 2
Roger Montgomery
December 4, 2025
From South Sea to AI: Artificial Intelligence (AI) companies seem to be asking investors the question: Just how long can growth be built on the question of future returns – and a productivity revolution – that are by no means guaranteed?
The South Sea Bubble of 1720 remains the archetype of a financial mania driven by exotic new ‘tech’, the promise of monopoly returns, and limitless public imagination.
At first, the idea of comparing the South Sea bubble to an AI boom 305 years later seemed far-fetched. AI is not, for example, a Ponzi scheme being promoted by those who fail or refuse to publish financials or forecasts of how profits will be made. continue…
by Roger Montgomery Posted in Investing Education, Market commentary, Technology & Telecommunications.
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The calculus of madness: Part 1
Roger Montgomery
December 3, 2025
Sir Isaac Newton is enshrined in history as the saint of rational thought. He decoded the laws of gravity, invented calculus, and parsed the rainbow. Yet, in the spring and summer of 1720, the arguably most intelligent man in the British Empire made a series of financial blunders, recorded for posterity, and so catastrophic they have become a cautionary legend in economic and investment history.
Newton’s entanglement with the South Sea Company serves as a stark reminder: in the face of collective delusion and market mania, even a genius can be led astray. continue…
by Roger Montgomery Posted in Investing Education, Market commentary, Technology & Telecommunications.
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From the horse’s mouth
Roger Montgomery
December 1, 2025
Recently, the BBC interviewed Sundar Pichai, the CEO of Alphabet, Google’s parent. With all the claims the artificial intelligence (AI) boom is a bubble – something I have noted cannot be known until after the event – I wonder whether the BBC was motivated to go to the source.
Describing the surge in AI funding as a remarkable period, yet one marked by certain unrealistic expectations, Pichai warned viewers of BBC News that no business would escape unscathed if the AI boom collapses. continue…
by Roger Montgomery Posted in Global markets, Market commentary, Technology & Telecommunications.
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Are U.S. rate cut expectations reasonable?
Roger Montgomery
November 28, 2025
The U.S. Federal Reserve (The Fed) has two main mandates: supporting employment and controlling inflation. Until Friday, it looked as if the two were almost perfectly balanced against each other, suggesting that the Fed would keep rates on hold in December.
Last week, Wall Street decided that a December cut was off the table. On Wednesday, the Chicago Mercantile Exchange (CME) Fedwatch futures index placed the probability of a cut at just 30 per cent.
Meanwhile, JPMorgan published a note predicting a January cut. Markets sold off dramatically, with the Nasdaq 2.74 per cent lower, and the S&P 500 losing 1.95 per cent last week. And there were of course, fears of a bubble in the artificial intelligence (AI) theme, which we have written about here copiously. continue…
by Roger Montgomery Posted in Economics, Global markets, Market commentary.
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Bitcoin has crashed. Could AI be next?
Roger Montgomery
November 26, 2025
The father of a field of mathematics known as fractal geometry, Benoit Mandelbrot, in his fantastic book, The (Mis)behaviour of Markets, observed that market price movements, unlike the smooth curves assumed in traditional financial models, are jagged and irregular, meaning that large price swings are more frequent than expected, and periods of high volatility can be followed by more high volatility. His work provides a more realistic framework for understanding and modeling risk, noting also that volatility in markets tends to cluster.
In my experience, I’ve observed those volatility clusters often mark turning points in markets. To be clear, not all periods of heightened volatility are turning points, but almost all turning points are accompanied by greater volatility. continue…
by Roger Montgomery Posted in Economics, Market commentary, Market Valuation.
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Why the people building AI won’t touch it
Roger Montgomery
November 25, 2025
U.S. Senator from Vermont, Bernie Sanders, and Professor Geoffrey Hinton – considered the ‘Godfather of AI’ – pointed out last week at Georgetown University that artificial intelligence (AI) and robotics aren’t inherently bad, but the people pushing this technology revolution are the richest people in the world. They suggest that Musk and Bezos, for example, aren’t staying up at night worrying about ordinary people. They aren’t worrying about working people. They’re not spending hundreds of billions of dollars to extend life expectancy, address global warming, shorten the workweek, and guarantee high-quality health care. They simply want more wealth and more power. continue…
by Roger Montgomery Posted in Market commentary, Technology & Telecommunications.
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ABC The World Today – looking past the AI hype
Roger Montgomery
November 24, 2025
I joined Angus Randall and Julia Bergin from ABC The world to discuss why, despite artificial intelligence’s (AI’s) enormous long-term promise, early investors often face the highest risks. History shows that major technology advancements usually go through a boom–bust cycle, which is why caution – not blind optimism – is essential right now.
Catch the segment here: Calls to boost Australian investment in AI. continue…
by Roger Montgomery Posted in Market commentary, Radio, Technology & Telecommunications.
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How General Purpose Technology Booms end – Part Two
Roger Montgomery
November 24, 2025
In this final part of my two-part series on General Purpose Technology (GPT) booms, I explain how these cycles typically end. History shows that even world-changing technologies – from cars to commercial flight – delivered poor outcomes for most early investors. This is because technology trends eventually run into the reality that customers don’t spend money in a straight line (their demand rises and falls), and also the concept of “creative destruction” (wherein new technology leads to the obsolescence of outdated products). These cycles are exactly why it’s important to diversify and regularly rebalance your portfolio. continue…
by Roger Montgomery Posted in Market commentary, Market Valuation, Technology & Telecommunications, Video Insights.
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But nothing’s changed!
Roger Montgomery
November 21, 2025
Wall Street on Thursday experienced a stunning reversal in sentiment. Impressive results from the company spearheading the artificial intelligence (AI) revolution, Nvidia (NVDA), and a strong September jobs report initially drove the Nasdaq up more than two per cent.
On Wednesday, Nvidia’s CEO Jensen Huang had described demand for its Blackwell chips as “off the charts”, and dismissed fears of an AI bubble on the company’s earnings call.
Meanwhile, the U.S. economy added 119,000 jobs in September, meaning the labour market was in better shape than previously thought. continue…
by Roger Montgomery Posted in Companies, Global markets, Investing Education, Market commentary, Market Valuation.
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MEDIA
ABC Nightlife – market downturn and the AI bubble
Roger Montgomery
November 20, 2025
I joined Phil Clark on Nightlife to explain why the market’s sharp fall may reflect growing doubts about the artificial intelligence (AI) boom. I argued that while AI is a powerful General Purpose Technology (GPT) that may change the world (like cars or the internet), it might not be as lucrative as investors hope. Today we’re seeing super-charged share prices, huge data-centre spending, complex vendor-financing deals and big losses at firms like OpenAI. Whether this proves a correction or a bust is unknowable, so my message to investors was simple: regularly rebalance and diversify beyond the AI winners.
Tune into the full episode from 4:49 here: ABC Nightlife Finance
by Roger Montgomery Posted in Market commentary, Market Valuation, Radio, Technology & Telecommunications.