Before convincing oneself, one must consider the downside. The idea that evidence reveals a conditionality, rather than creating an equivalence, is an essential warning. If this intrinsic equivalence is dependent on strict assumptions, which makes it vulnerable, the integration of volatile market conditions or unforeseen exogenous shocks, such as a major global pandemic, into sensitivity models is an essential step of caution. This allows determining whether the equilibrium persists in extreme situations, which is the mandate of this type of analysis.