The Illusion of “Cheap Debt”


I recently saw someone say:

“I never understood why people pay off a 3.5% mortgage. You can invest the money and earn more.”
On paper, that math works—but it assumes the world stays stable. It is what Refer to as the illusion of Cheap Debt.

What 2008 Really Looked Like.

During the Global Financial Crisis, I saw a very different reality.

Home values collapsed, leaving many people in negative equity—owing more than their homes were worth. The S&P 500 dropped dramatically, and layoffs spread across the economy.

Cheap Debt

2008 tested the country

People who had invested instead of paying down debt suddenly faced a brutal situation: their investments were down, their jobs might be gone, and mortgage payments were still due. I remember watching friends forced to sell investments at huge losses just to cover living expenses.

The spreadsheet says: 3.5% mortgage vs higher market returns.

Real life sometimes looks like:

market down 40–50%, income uncertain, and debt that doesn’t disappear.

Cheap debt works best in stable systems. In 2008, the U.S. lost 8 million jobs. The problem is we rarely know when the system will stop being stable.

My Personal Experience - "Cheap Debt" turned out to be quite expensive

During the crisis, J.P. Morgan Chase agreed to purchase Bear Stearns on March 16, 2008, in a weekend emergency deal. I was told I would have to reapply for my job. At that point, I had 20 years with J.P. Morgan. With a wife and two kids, I went home that night deeply concerned. I consulted my trusty budget spreadsheet: How long can we last?

We had no debt—no mortgage, no credit card debt, nothing. My wife and I are both debt-averse and prefer modest, debt-free lives over possessions. Thankfully, the spreadsheet said we could last a very long time. No debt meant a low monthly expense run rate, and at that moment, it was a great place to be. Meanwhile, friends of ours faced job loss and, not long after, lost their homes.

Lessons From The Data

Research confirms this widespread financial stress. A National Bureau of Economic Research study found:

“Nearly 40 percent of households experienced financial distress at some point during the crisis period.”

Distress included:

  • unemployment
  • falling behind on mortgages
  • homes worth less than the mortgage

Preparing for Uncertainty

And today, we’re entering another period of uncertainty, with Artificial Intelligence potentially reshaping job markets. If I were dependent on a corporate job right now, I wouldn’t be making any significant discretionary purchases.

Being debt-free isn’t just comforting—it’s insurance against a world that rarely behaves like a spreadsheet.

Source: The Effect of the Economic Crisis on American Households

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