There’s an old economic principle every investor should know—but too few do.

“When a measure becomes a target, it ceases to be a good measure.”

That’s Goodhart’s Law. It sounds academic, but it explains a lot about what’s wrong with today’s stock market—especially the cult of passive index investing.

Passive Funds: The ‘Genius’ That Became a Monster

We’ve all heard it:

• “Just buy the S&P 500.”

• “You can’t beat the market.”

• “Low fees are all that matter.”

For decades, that advice worked. Index funds democratized investing, slashed fees, and delivered market returns without Wall Street gimmicks.

But what started as the solution is now part of the problem.

Today, the S&P 500 isn’t just a benchmark. It’s the single most crowded trade in history. And it’s distorting the very market it’s supposed to measure.

The Rise of the Mindless Buyer

Here’s the truth:

Index funds don’t analyze companies.
They don’t care if a stock is cheap or expensive.
They just buy—in proportion to size.

When money pours into an S&P 500 ETF, it buys the biggest stocks first: Apple, Microsoft, Nvidia, Amazon. The bigger their market cap, the more new dollars they attract.

It’s momentum investing on autopilot.

This creates a dangerous feedback loop:

• Prices rise because passive funds buy them.

• Rising prices make those stocks even bigger in the index.

• Passive funds buy even more next time.

Fundamentals? Cash flow? Debt? Management quality? Who cares. Price is the only signal in this system.

The S&P 500 trades at elevated multiples compared to history.

This isn’t theoretical.

Look at the S&P 500’s valuation today:

• Trades at ~29x earnings.

• Dividend yields are pitiful next to risk-free Treasuries.

Yet money keeps flooding in because the machine is programmed to buy.

The Selloff Nobody Is Planning For

It’s not just overpricing.

Passive funds are mindless sellers, too.

What happens when Baby Boomers—who hold most of the wealth—start making mandatory retirement withdrawals? Or when a recession triggers panic redemptions?

Index funds will dump stocks with the same blind discipline they used to buy.

No one steps in to say “These prices are too cheap.”

Just sell, sell, sell.

The same feedback loop that drove prices up can work in reverse—and fast.

Passive Ownership Growth Chart

Passive funds’ share of market ownership has exploded since 1995.

Look at how market ownership has changed.

Passive strategies went from a small share to a dominant force.

The more passive funds dominate, the less price-sensitive human judgment remains. Active managers—who used to buy dips and sell rallies—have been crowded out.

A memorable insight from Mike Green comes from a simple analogy he shared in a recent podcast interview with Thoughtful Money’s Adam Taggart, linked here.

The Rug Shop Analogy

Mike Green uses a perfect analogy:

Imagine you walk into a rug shop.

• The shopkeeper says it’s $1,000.

• You hesitate. Maybe you negotiate.

• He says, “Okay, $500,” and you buy.

A normal buyer weighs price and value.

But a passive fund?

• $1,000? “I’ll take it.”

• $1,500? “Sure.”

• $2,500? “Absolutely.”

Price isn’t a brake. It’s the gas pedal.

Goodhart’s Law Strikes Again

Here’s where Goodhart’s Law hits.

The S&P 500 was supposed to measure corporate America’s health.

Now trillions are programmed to target owning it at any price, so it stops being a good measure. It becomes a self-reinforcing illusion.

Market strength isn’t about profits or innovation. It’s about mindless, price-insensitive inflows.

The Demographic Time Bomb

Let’s talk demographics.

• Boomers own most of the wealth.

• They’re aging.

• At 72, they must start taking distributions from retirement accounts.

That creates steady outflows.

Meanwhile, younger generations are buried in student debt, high costs, and stagnant wages. They’re not investing enough to offset Boomer withdrawals.

Passive funds rely on net inflows. What happens when those turn negative?

Don’t Expect History to Save You

Here’s the lie:

“The market always returns 8% a year in the long run.”

That was built on:

• Higher rates encouraging valuation discipline.

• Active managers providing liquidity.

• Demographics delivering constant new retirement savings.

Those conditions are changing fast.

So What Should You Do?

This isn’t about panic. It’s about preparation.

Ask yourself:

✅ Are you relying entirely on index funds with no plan for valuation risk?
✅ Are you assuming constant inflows will bail you out?
✅ Are you ignoring real assets like real estate that don’t depend on index flows?
✅ Are you prepared to be the forced seller in a bear market, or the buyer of quality on sale?

Passive investing isn’t evil. But it’s not a one-size-fits-all answer anymore.

Real investing means thinking.
It means understanding incentives.
It means questioning easy answers.

Because markets aren’t magic. They reflect human behavior—and human incentives.

Diversifying into private lending can provide reliable, non-market-correlated income.

An Alternative Worth Considering

If you’ve read this far, you know I don’t sugarcoat things.

Passive investing has structural risks most people ignore. That’s why real diversification matters now more than ever.

One strategy worth serious attention is private real estate lending.

High rates have made traditional rentals tougher to cashflow. But they’ve also created an exceptional opportunity to be the bank.

Here’s why:

• Private lending generates consistent monthly income regardless of stock market cycles.

• High rates mean lenders can earn materially higher returns.

• Strong operators in this space have actual track records.

This isn’t theory. I’m investing in a private lending opportunity through Dynamo Capital.

Here’s what got my attention (and our team at Property Llama Capital):

✅ Above-market returns, with 32.68% LP return in 2024.
✅ Investors share in loan origination fees—rare in this space.
✅ Focus on underserved real estate markets with less competition.
✅ Dynamo’s principals have $2M+ of their own capital invested.
✅ We negotiated for our investors to earn 10–24% more than Dynamo’s standard returns.

We didn’t just accept it at face value. We spent months vetting Dynamo’s underwriting and operational track record.

For transparency? Dynamo’s founder is available to speak directly with investors.

👉 Explore the Dynamo Opportunity & Data Room Here

This isn’t personal investment advice. Do your own due diligence. Understand the risks.

But if you’re tired of being a passenger in an overvalued index, this is the kind of real-world diversification that actually makes sense.

If you want to learn more, or talk about your overall investment strategy, let’s have a conversation.

📞 Call or text me @ 303.249.4262

Happy Investing!