apply-contagion-risk-mapping

Apply Contagion Risk Mapping

Map your exposure to cascade failures from entities in your implicit network — not just explicit strategic partners — because failure propagates through proximity and shared infrastructure, not only through deliberate relationships.

Why This Is Best Practice

左传 僖公五年 (655 BC) — 宫之奇谏假道:

虢，虞之表也。虢亡，虞必从之。唇亡则齿寒。

"Guo is the outer protection of Yu. If Guo falls, Yu must follow. When lips are gone, the teeth feel cold."

Why best: In 655 BC, the Duke of Jin requested passage through the state of Yu to attack the neighboring state of Guo. The minister Gong Zhiqi warned the Yu ruler against granting the passage: Yu and Guo were structurally interdependent — Guo provided outer protection to Yu without any formal alliance treaty requiring it. If Guo fell, Yu would be exposed and would inevitably follow. The Yu ruler granted the passage, Jin defeated Guo, and on the return march, Jin absorbed Yu as well. The classical commentators use this case as the canonical illustration of cascade failure through proximity: the threat did not come from a direct enemy relationship, but from the collapse of an adjacent entity that Yu had not recognized as load-bearing for its own survival. 唇亡齿寒 ("when lips are gone, the teeth feel cold") became standard vocabulary in Chinese strategic and risk analysis for implicit interdependence that only becomes visible when it fails.

Basel III Systemic Risk Framework (BIS, 2010): Enacted after the 2008 financial crisis, which demonstrated that individual firms can be solvent while the system collapses through contagion. Basel III introduced the concept of "systemically important financial institutions" (SIFIs) — entities whose failure creates cascade risk for others not directly connected to them contractually. The key finding: traditional risk models assessed bilateral exposure (what do I owe to, or own of, this counterparty?) but missed network-level exposure (what happens to me if an entity I depend on indirectly fails, or if shared funding sources dry up?). Basel III requires banks to hold additional capital buffers proportional to their systemic interconnectedness, not just their bilateral credit exposure. Standard across 28 BCBS member jurisdictions covering ~90% of global banking assets.