The negotiating arrangements ordered by an economic order focused to supply the financial market creates an inherent weakness to the system itself. This weakness reflects the decision taking of individuals through the socioeconomic events arising in this market. Simple news reports may trigger a systemic crisis. The present article investigates this proposition, in other words, which economic and legal factors can cause and control the drastic effects on the economy, like the bank run the most visible of these phenomena. Using economic theories related to legal doctrine, it shows up in an interdisciplinary way that society is not a square matrix of linear factors, but a complex system of negotiation exchange governed by the human (ir)rationality.