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While most currently consider bubbles a dangerous precondition for a stock market crash, they can also be better navigated by appreciating they’re a necessary step on the road to humanity’s advancement.

As I have noted previously, there’s a myriad of definitions for asset bubbles, but most fall into two camps: those that measure overvaluation and those that observe the behaviours and conditions that typically give rise to it.
This article was first published in The Australian on 20 December 2025. Continue…

by Roger Montgomery Posted in In the Press, Investing Education, Market commentary, Technology & Telecommunications.

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In this week’s video insight, I look at the dynamics behind major technology booms – from steam trains and commercial flight to the internet and now artificial intelligence (AI). In Part 1 of this two-part series, I outline the typical signs of a bubble: including soaring share prices, circular deals between companies, rising sales on credit, and financial engineering that makes growth look stronger than it truly is. We’re seeing many of these patterns in today’s AI boom. In Part 2, I’ll explain how these booms have typically unwound. Continue…

by Roger Montgomery Posted in Technology & Telecommunications, Video Insights.

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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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I joined Niav Owens on ABC Newcastle Mornings yesterday to discuss why cash is making a comeback – despite the rise of digital payments – and why it still plays an important role in budgeting, privacy, and accessibility. We also touched on the trillions being poured into artificial intelligence and whether those investments can truly deliver the returns investors expect.

You can listen to the full episode from 14:13 here: ABC Newcastle Mornings.  Continue…

by Roger Montgomery Posted in Economics, Global markets, Radio.

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I joined Paul Turton on ABC Newcastle Mornings today to discuss the broader economic backdrop, including why interest rates are likely to remain steady for now, how household spending and cost pressures are shaping the outlook, and why global sharemarkets are being driven less by local conditions and more by international themes such as investment in artificial intelligence (AI), with long-term returns ultimately depending on earnings and business fundamentals.

Tune in from 37:54 to hear the full segment: ABC Newcastle Mornings. Continue…

by Roger Montgomery Posted in Radio.

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In my latest article for Nabtrade, I explore why investors are rarely able to identify a bubble until after it has burst, and why the signals today suggest it may be prudent to prepare for a shift in 2026. Diversification and rebalancing is becoming increasingly important as market conditions become more turbulent. 

You can read the full article here: Bubbles create a shadow – time to move out from the shade. Continue…

by Roger Montgomery Posted in On the Internet.

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I joined Juliette Saly on Ausbiz to reflect on how markets closed out in 2025 and what may lie ahead in 2026. Last year was again dominated by artificial intelligence (AI) and the Magnificent Seven (Apple, Microsoft, Amazon, Alphabet, Meta, Nvidia and Tesla). However, with valuations now stretched amongst these technology leaders, there may be opportunities for investors beyond the headlines.  Continue…

by David Buckland Posted in Companies, Market commentary, Small Caps, Stocks We Like, TV Appearances.

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For every equity that trades, there is a buyer and seller. Often there are functional reasons for selling, such as paying down a loan, paying tax, distributing an inheritance, or meeting retirement spending needs. Putting those aside, another reason for selling is the harbouring of a negative outlook on the share market in general or the sector or individual stock. But there is also a buyer on the side, who may hold the polar opposite view and outlook.

And if we assume both investors have access to the same information, the difference in outlook can only be attributed to a difference in perception.

Take for example the spending by artificial intelligence (AI) hyperscalers on their infrastructure buildout, estimated to be US$3 trillion by 2029. Continue…

by Roger Montgomery Posted in Economics, Insightful Insights, Investing Education, Market commentary.

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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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This Christmas, perhaps more than any other in recent years, it might be time to spare a thought for Ernest Hemingway’s short story The Capital of the World. Continue…

by Roger Montgomery Posted in Market commentary.

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