There's a particular kind of vertigo you feel in 2026 when you look at the markets. On one screen, an AI model writes code that would have taken a team a quarter. On another, a handful of companies have grown so large they practically are the market. And somewhere in your group chat, someone is either very rich or very ruined from a coin you'd never heard of last Tuesday. It can feel like the old rules have been repealed — like prudence is a relic and the only sin left is not betting big enough.
I want to make the opposite case. The modern era didn't kill the timeless principles of investing. It amplified the need for them.
Educational, not financial advice. This essay is one person thinking out loud about ideas and history. It is not a recommendation to buy, sell, or hold anything. Your situation, time horizon, and risk tolerance are yours alone. Talk to a fiduciary who knows your numbers before you act.
Bogle was right, and 2026 proved it again
Start with the boring fact that keeps winning. In 2025, roughly 79% of active large-cap funds lost to the S&P 500 (per SPIVA). Stretch the window to twenty years and that figure climbs to about 92%. These aren't amateurs — they're professionals with Bloomberg terminals, research teams, and every incentive to win. And the index quietly beat almost all of them. Passive funds now hold the majority of fund assets, which means the world has finally, slowly, voted with its money for what Jack Bogle argued his entire life: cost and discipline beat cleverness over time.
