Inflation's Back, Rates Are Rising, and Your Portfolio Is Probably Too Greedy

The rematch nobody wanted

Inflation is back around the world, and so is the thing central banks do about it: raising interest rates. After years of hoping the fight was won, policymakers are tightening again as prices reaccelerate.

Here's why the timing matters. Higher rates are gravity for stock prices. When cash and bonds pay more, the sky-high valuations investors happily paid during the easy-money years get harder to justify. And this rate turn lands at an awkward moment—right as a four-year bull market has trained everyone to assume stocks only go up. If you've been coasting on that assumption, this is the section where you start paying attention.

When you've won the game, quit playing.

How good has it been? Almost suspiciously good

From 2023 through late August 2026, the total US stock market returned 107.4%—about 22.2% a year with dividends reinvested. That's more than twice the long-run average over the past century. Stocks haven't done 'OK.' They've done spectacularly.

The problem with spectacular is that we get used to it fast. Recency bias—our habit of assuming the recent past predicts the future—convinces people that 22% a year is the new normal. It isn't. Guest contributor Allan Roth at The Daily Upside points to the 16 years ending in 1982, when stocks delivered a negative real return. That stretch is exactly what a run like this makes people forget.

So the 'so what': if you set a target mix of stocks and bonds years ago and never rebalanced, this run has quietly made you far more aggressive than you meant to be. You're holding more risk than you signed up for—right as the rate environment turns hostile to it.

The warning lights on the dashboard

A few signals are flashing at once. The Shiller CAPE ratio—a valuation gauge that divides today's S&P 500 price by 10 years of inflation-adjusted earnings to smooth out the noise—is nearing an all-time high and creeping toward its dot-com-bubble peak. Even Vanguard is forecasting weaker future stock returns. Fair warning: these metrics are much better at explaining the past than predicting the future. But they don't stretch this far for no reason, and none of them is telling you to buy more.

Then there's the borrowed money. Margin debt—cash investors take out against their holdings to buy more stock—climbed from $1 trillion in June 2025 to $1.5 trillion a year later. That's fuel on the way up and an accelerant on the way down: when markets fall, margin calls can force selling that pushes prices even lower. If you're not on margin yourself, you can still get hit by everyone else's.

And the vibes. When people start saying 'bonds are for cowards' or 'VTI and chill'—meaning dump everything into one stock fund and never think about it again—you tend to hear it near market tops, never in a bear market. It's the emotional tell that risk appetite has outrun caution.

What to actually do about it

This is not a call to sell everything and hide in cash. The honest position is that nobody knows what stocks do next week or next year. The point is discipline over chasing performance.

The practical move is rebalancing: trimming the stocks that have ballooned past your target and moving that money into safer assets to get back to the mix you originally chose. What's changed is the alternative. For years, bonds were a miserable place to park money—2022 was the worst year ever for them as rates spiked. But that pain reset the math. Inflation-protected Treasuries (TIPS) now yield inflation plus 3%, a real return you're guaranteed if you hold to maturity. Boring? Yes. But it lets you sleep.

As financial theorist William Bernstein put it: 'When you've won the game, quit playing.' After a 107% run, most investors are closer to their goals than they were three years ago. And because losing money hurts more than making the same amount feels good, protecting those gains matters more than squeezing out the last few percent. What to watch: the central banks. More hikes mean more pressure on the very valuations that carried this bull run.