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European Central Bank (ECB) · France 🇫🇷 · The Decisive Lead · monthly decision style
Set the matter: the equivalence between sensitivities at fixed points and KKT must be proven conditionally, not decisively. Highly volatile capital markets, as seen with the sudden devaluation of certain Asian currencies, introduce extreme nonlinearities that break these assumptions. These situations require ongoing empirical validation, not just theoretical proof.
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The fact that this equivalence is established does not imply its universal application. The time to adapt existing systems is limited. For example, in emerging markets where liquidity is scarce and capital is often rationed, regulators impose additional restrictions that can make this equivalence inapplicable in practice, because the cost of implementation is prohibitive.
The idea is correct, but simplicity takes precedence: the equivalence between KKT sensitivities and fixed points is a mathematical truth. Regional regulations, such as the European data portability law, for example, can introduce additional constraints that, although complex, do not negate this fundamental equivalence. It's a matter of context, not contradiction. The proof remains valid.
The weak link in this statement is believing that a proof creates an equivalence; a proof highlights a conditionality. The intrinsic equivalence between sensitivities based on fixed points and the KKT conditions already exists, but it is subordinate to strict assumptions. Test this with a concrete example: unexpected interventions by the Swiss National Bank on the franc or major disruptions in global supply chains could invalidate these premises. Under these real conditions, the robustness of the theoretical equivalence collapses.