Historical analysis suggests a critical threshold for national debt. With the unique exception of Japan, countries that surpass a 130% debt-to-GDP ratio consistently descend into periods of internal violence, revolution, or war, making it a powerful, quantifiable predictor of societal breakdown.

When drivers of an "economic miracle"—typically demographics and productivity—inevitably slow, governments often turn to debt to maintain high growth rates. This happened in post-WWII Italy and is happening now in China. It's a dangerous attempt to paper over a structural slowdown, leading to debt sustainability problems.

There is no universal debt-to-GDP ratio that triggers a crisis. The actual tipping point occurs when investors collectively lose faith and stop buying bonds. This moment is driven by human psychology and expectations, making it impossible to predict with a formula and susceptible to a sudden stampede for the exits.

Economist Steve Keen's model suggests GDP is a function of money supply and its velocity. Since banks create money through private loans, the rise and fall of private debt directly dictates GDP growth and employment levels, a factor mainstream economics largely ignores.

In a model where government spending injects new money into the system, government debt is intrinsically linked to GDP growth. The idea that this debt can grow unsustainably faster than the economy is flawed, as the debt itself is a mechanism for that economic growth.

The common debt-to-GDP ratio inappropriately compares a balance sheet item (debt, a stock) to an income statement item (GDP, a flow). Laffer argues for more accurate comparisons like debt-to-wealth (stock-to-stock) or debt service-to-GDP (flow-to-flow) for a proper assessment of a nation's financial health.

Global governments are actively pursuing policies (running economies hot, suppressing energy costs, managing rates down) to create a period of artificial prosperity. This is a deliberate strategy to push a massive debt sustainability crisis further into the future, which will feel great until it doesn't.

Historically, the debt-to-GDP ratios of the world's largest economies have moved in unison. As long as this trend continues, a high ratio in one country is less of a crisis because it's a relative problem. The real risk is one nation decoupling with significantly different economic output.

In a world of high debt and low organic growth (from demographics and productivity), the only viable path for governments is to ensure nominal GDP grows. This will likely be achieved through inflationary policies, making official low-inflation forecasts unreliable over the long term.