How to Invest During a Bubble Regime - Practical Lessons from Market History

In this episode of First Principles, Andy Constan explains how investors should think about portfolio construction, risk management and alpha during a bubble regime. We discuss why bubbles create FOMO, why low volatility can make investors take the most risk at the worst time, and how long-only and active investors can prepare for the other side without trying to call the top.Andy Constan on Xhttps://x.com/dampedspringDamped Springhttps://dampedspring.com/Main topics covered:Why bubble regimes require a different investor mindsetThe phases of a bubble: change, escalation, parabolic move and popWhy calling something a bubble does not mean calling the topHow FOMO and buyer’s regret lead investors into major mistakesWhy investors should know whether they are more vulnerable to chasing or panickingHow Andy thinks about the market portfolio beyond just stocks and bondsWhy stocks-only portfolios are less diversified than many investors realizeHow low-volatility uptrends cause investors to lever up at the wrong timeWhy rebalancing rules may need to change in a trending bubble marketHow cash, dollar-cost averaging and lump-sum investing should be evaluated through investor behaviorWhy many alpha strategies stop working as well in bubble regimesWhy momentum can work better than mean reversion during bubblesHow contagion spreads after bubbles pop and where future alpha may appearTimestamps:00:00 Why bubble regimes feel low risk00:59 Setting up part two on bubble positioning02:07 The phases of a bubble05:23 Why a bubble regime is different from a normal bull market07:23 How investors should shift their mindset10:29 Why knowing yourself is harder than it sounds14:00 Can a bubble resolve without popping?17:13 Why long-only investing should mean more than stocks24:21 Lowering maximum exposure in a bubble regime30:23 How 60/40 investors should think about rebalancing33:20 Cash, lump sums and dollar-cost averaging42:31 How active investors should adjust alpha strategies46:16 Why mean reversion can fail in bubbles49:41 How contagion spreads through markets54:06 Preparing for post-bubble opportunities without calling the top