The Architecture of Money · Part 6
When Debt Becomes a System: How the World Runs on Debt
One person’s debt is another’s asset. How governments, companies and households are wired together by debt.
I used to think: debt = money I owe.
But that is only the borrower’s perspective.
From the perspective of the entire system, debt is something completely different.
- My debt can be someone else’s asset.
- My government’s bond can be a bank’s asset.
- My mortgage can become an asset on a financial institution’s balance sheet.
And therefore:
Debt is not only an obligation. It is also a type of asset inside the financial system.
1. Governments Borrow
Governments issue bonds. Investors buy them.
The government receives money. The investor receives a promise: interest plus repayment of principal.
If the system works well, both sides can benefit. The government gets money to build. The investor gets an asset.
2. Companies Borrow
Companies borrow to:
- build factories
- purchase machinery
- hire workers
- expand into new markets.
If the investment earns more than the cost of the debt, debt becomes leverage for growth.
3. People Borrow
People borrow to:
- buy homes
- buy cars
- study
- start businesses.
Without credit, many people would wait a very long time before buying a major asset.
So debt is not automatically bad.
The question is:
Is the debt being used to create value, or merely to postpone the problem?
4. The Number That Caught My Attention
According to the IMF’s Global Debt Monitor, published in September 2025, total global debt stayed just above 235 percent of world GDP in 2024, about $251 trillion.
Public debt was nearly 93 percent of global GDP, about $99 trillion. Private debt was under 143 percent of GDP, about $152 trillion.
$251 trillion. A number so large that an ordinary person can barely imagine it.
But the important point is not simply “there is too much debt.”
It is this: the modern economy has been built together with debt.
5. So Who Owes Whom?
This is a fascinating question. If the entire world is in debt, who are the creditors?
The answer: we are debtors and creditors at the same time.
You deposit money in a bank. Legally, the bank now owes you that money. You are the bank’s creditor.
The bank lends part of its funding to a borrower. The bank becomes the borrower’s creditor.
An investment fund buys government bonds. The government is the debtor; the fund holds the asset, often on behalf of savers and retirees.
And the entire system becomes a network.
6. The Real Question
The biggest question is not “does the world have debt?”
It is:
How much of the system would keep functioning if confidence in people’s ability to repay disappeared?
This is where money, debt, banking and capital markets meet.
From here, we move up a level: the five levels of finance.
What This Means for Your Money
The global system can carry debt at 235% of GDP. A household cannot, because your debt is not someone else’s asset on your balance sheet. It is a claim on your future paycheck.
The CFPB explains that “your debt-to-income ratio (DTI) is all your monthly debt payments divided by your gross monthly income.” Lenders use it to judge how much more you can safely carry.
One step this week: add up your monthly debt payments, divide by your gross monthly income, and write the number down. Then use our debt payoff calculator to see how extra payments lower it over time.
Sources: IMF Blog, “Global Debt Remains Above 235% of World GDP” (Sept. 17, 2025); IMF Fiscal Affairs Department, 2025 Global Debt Monitor; CFPB, “What is a debt-to-income ratio?”.
This is Part 6 of The Architecture of Money, a DebtRoute series on how money really works. Next: The 5 Levels of Finance. Follow DebtRoute on Facebook or join the DebtRoute Discord to get the next part. Educational content, not financial advice. Images are illustrative. DebtRoute is not affiliated with the IMF.