Debt Cycle Mechanics

Credit is purchasing power that can be created almost at will — and that single fact generates all macro cycles. The spending-income identity (one person’s spending = another’s income) means credit is simultaneously stimulative and self-defeating over time. a-00048, a-00159

Core Principle

“Credit is the primary vehicle for funding spending and it can easily be created. Because one person’s spending is another’s earnings, when there is a lot of credit creation, people spend and earn more, most asset prices go up, and most everyone loves it… Credit also creates debt that has to be paid back, which is a drag on future spending.” — a-00048

Every dollar of credit issued is a future obligation. The expansion feels self-reinforcing; the contraction is inevitable. This is the engine of all debt cycles.

Two Cycle Types

• Short-term (~6 years): Reversible by CB rate cuts. Recession → easing → boom → inflation → tightening → weakness. a-00068
• Long-term (Big Cycle, ~75 years): Not reversible by rate cuts alone; requires restructuring and/or monetization. a-00051

The long-term cycle forms because each short-term cycle’s debt peak exceeds the prior — a secular ratchet upward in debt-to-income ratios. a-00050 When the long-term cycle peaks, rate cuts are spent; only restructuring or monetization remains.

Debt Crises Are Inevitable

“Throughout history only a few well-disciplined countries have avoided debt crises. That’s because lending is never done perfectly and is often done badly due to how the cycle affects people’s psychology to produce bubbles and busts.” — a-00063

Policy maker bias toward easy credit: near-term rewards are visible and politically rewarded; long-term debt buildup is diffuse. a-00162 The asymmetry means that excess credit — and eventually a crisis — is the modal outcome over a full cycle lifetime.

Inference

The implication for risk management: sovereign debt crises are not tail events — they are the modal outcome over a full cycle lifetime. Size positions accordingly.

Debt Sustainability: The r vs. g Trap

When the interest rate on debt (r) exceeds the economy’s growth rate (g), debt-to-income ratios rise automatically even with no new borrowing. a-00072, a-00073 This is the trap that defines late-cycle dynamics: once r > g persists, even austerity can fail — the growth it contracts is larger than the fiscal savings. a-00086

The math removes escape routes one by one. That is why the nine-stage crisis sequence in 05-sovereign-debt-stress is nearly deterministic once a sovereign enters the trap.