Economic Fragility as a Dynamic Constraint: Commitments, Coordination, and Irreversibility

Macroeconomic stability is often interpreted as evidence of resilience, effective policy, or accurate modeling. Yet the most severe economic disruptions of the past century have occurred during periods of apparent calm. This paper proposes a descriptive framework for understanding macroeconomic fragility not as a probabilistic tail risk or a forecasting failure, but as a dynamic constraint arising from the interaction between accumulated economic commitments and available policy space. Fragility is defined as the gap between these two quantities and examined in both level and rate form. The framework emphasizes coordination feasibility, irreversibility, and the non-unitary nature of macroeconomic systems. Liquidity and confidence are reinterpreted as coordination states, and crises are framed as forced structural resolutions rather than unexpected shocks. A qualitative historical sketch of the 2008 Global Financial Crisis illustrates the interpretive use of the framework. This paper is intentionally non-predictive and non-prescriptive. Its contribution is classificatory: to provide a unified lens for interpreting macroeconomic breakdowns as endogenous outcomes of accumulated constraints rather than failures of foresight.