Every Crisis Widens The Debt-Equity Spread. Here Is The Mechanism.
That comparison is a starting point. The more interesting question is what makes the gap between them widen or narrow over time. The answer turns out to be mechanical, and once you see the pattern it is hard to unsee.
The chart below tracks both measures from 1990 through 2025. Equity market capitalization comes from the World Bank and the World Federation of Exchanges. Total global debt comes from the IIF Global Debt Monitor and the IMF Global Debt Database. The shaded band between the two lines is the spread.
When the spread compresses
Look at the periods where the lines converge. There are really only two clean ones in the data.
The first runs from roughly 2003 to 2007. Global equity nearly doubled, from about $31 trillion to over $60 trillion. Debt rose too, but more slowly. The ratio of equity to debt peaked at about 41 percent in 2007, the highest reading of the post-2000 era.
The second runs from 2016 through 2021. Same dynamic. Equity ripped higher into the post-COVID melt-up while debt was already at elevated post-crisis levels and growing at a slower clip. By 2021 the ratio touched 37 percent. Close, but not quite as tight as 2007.
What both periods have in common is straightforward. Equity bull markets ran uninterrupted, with no major credit event forcing a policy response. Equity is mark-to-market. When sentiment is good and earnings expectations rise, the global float of stocks revalues higher in real time. Debt does not work this way. Debt grows because someone has to issue it, and issuance is sticky.
When the spread explodes
Now look at the crisis years.
In 2007, the spread was about $89 trillion. By 2010, it was $141 trillion. Equity got cut nearly in half between 2007 and 2008. Debt accelerated, because debt was the policy response. Bank bailouts, sovereign deficits, central bank balance sheets, QE. All of it lands on the debt side of the ledger. None of it puts equity back where it was.
Same story in 2020. Equity briefly cratered. Debt jumped by more than $30 trillion in a single year, the largest absolute increase ever recorded. By the time the dust settled, the spread had blown out by another $80 trillion.
This is the mechanical part. Equity is destroyed in months when sentiment turns. Debt is the policy answer to that destruction, and once issued it stays issued. The system never deleverages back to where it started. It just resets at a higher level and waits for the next shock.
The structural trend
Zoom out and the picture is clear. In 1990 the spread was about $30 trillion. In 2025 it is about $212 trillion. The spread has grown by a factor of seven over thirty-five years. Equity grew roughly 14x in that window. Debt grew about 9x. Debt grew less in percentage terms, but it grew from a much larger base, so the absolute gap keeps widening every cycle.
There has been exactly one period in the entire dataset where the spread narrowed for more than two consecutive years without a crisis ending it. That was 2003 to 2007. The 2016 to 2021 stretch came close, but it was always living on borrowed time.
What it means
If you accept the mechanical framing, a few things follow.
The compression you see in the chart during the good years is equity catching up to where debt already is. Debt does not drift back down. No major economy has been willing or able to actually deleverage at the system level since the early 1990s. Pretending otherwise is fantasy.
Crises do not deleverage the system either. They reset it higher. Every spread expansion since 1990 has come from a credit event that triggered a policy response that added permanent debt to the stack. The next one will work the same way.
The next major spread compression will require either an extended equity melt-up with no major policy event interrupting it, or actual debt restructuring at the sovereign level. The first is possible. The second has not happened in any major economy in living memory.
