The limited importance given to risks of a systemic nature was thus responsible, to a large extent, for the massive underestimation of the quantity of risks borne by market players, as shown by the unfolding of the crisis.
In general, the evaluation methodology of the quantity of risk and the price of a unit of risk has turned out highly inadequate in the light of the current experience. The dominant models rely on simplified hypotheses, consisting of laws of probabilities about future events. The periods of crisis bring to light the major shortcomings of the underlying mathematical models.