Chapter 14: You'll Change -

Long-term financial planning is harder than it seems because people’s goals and desires change over time. The person you are today is not the person you’ll be in 10, 20, or 30 years. Yet most financial planning assumes your goals will stay constant.

This creates a challenging puzzle: how do you plan for a future self whose wants and needs you can’t predict?

The End of History Illusion

Psychologists have documented what they call “the End of History Illusion.” At every age, people recognize how much they’ve changed in the past but underestimate how much they’ll change in the future.

A 30-year-old knows they’re different from their 20-year-old self, but assumes their 40-year-old self will be similar to who they are now. This is consistently wrong.

The Research Finding

Harvard psychologist Daniel Gilbert found that 18-year-olds paid $129 to see their current favorite band, but 40-year-olds would only pay $80 to see their favorite band from 10 years ago. Why?

Because people change. What seems essential today becomes less important tomorrow. This applies to everything from music preferences to career goals to how much house you want.

"We should avoid the extreme ends of financial planning. Assuming you'll be happy with a very low income, or assuming you'll be happy working endlessly, are scenarios that are likely wrong because you'll change." — The Psychology of Money, Chapter 14

The Problem with Extreme Plans

This insight has important implications for financial planning:

Extreme Frugality

Saving aggressively for early retirement assumes you'll be happy living on very little forever. But your future self might have different needs: health issues, children, new interests.

Extreme Work

Working extremely hard now to enjoy later assumes you'll still want to travel and have adventures when you're older. But your energy, health, and interests will change.

The Sunk Cost Trap

One of the most dangerous consequences of not accepting change is the sunk cost trap. When people change but refuse to acknowledge it, they keep pursuing goals that no longer make them happy.

The lawyer who hates their job but spent years getting the degree. The person in the wrong city who bought a house. The investor committed to a strategy that doesn’t fit their new circumstances.

Embrace the Idea of Having Your Mind Changed

The solution isn’t to find the perfect unchanging plan—that doesn’t exist. Instead:

Accept that your goals will evolve
Avoid extreme financial positions that are hard to reverse
Build flexibility into your plans
Don’t feel trapped by past decisions
Review and adjust regularly

What This Means Practically

Avoid locking yourself in: Don’t make irreversible decisions based on today’s preferences
Balance present and future: Neither extreme sacrifice nor extreme indulgence accounts for change
Build options: Savings and skills give you flexibility to adapt
Accept that past plans might not fit: It’s okay to change course

The Regret of Rigidity

The person who regrets most isn’t the one who changed their mind. It’s the one who knew they should change but felt trapped by their earlier decisions. Financial flexibility prevents this trap.

The Moderate Path

Housel advocates for moderation not because it’s the optimal path, but because it’s the most adaptable:

A moderate savings rate lets you enjoy today while building for tomorrow
A moderate lifestyle is easier to adjust up or down
Moderate commitments can be changed without catastrophic loss

Moderation is the only position that acknowledges we’ll become different people with different goals.

Key Takeaways

You will change: Your goals, desires, and needs will evolve over time
End of History Illusion is real: We underestimate future change at every age
Avoid extremes: Extreme plans don’t account for the person you’ll become
Build flexibility: Keep options open for your future self
Accept sunk costs: Don’t let past decisions trap you in an unhappy present