The author studies the incommensurability of economic models as a type, little explored of unconstitutionality, called the unconstitutionality for incommensurability of economic models. The author statutes that many of Colombian rules relapse in this type of methodological error and, due to the lack of attention regarding the economic technique, no one had referred to this phenomenon. To explain the concept, the author analyses the case: of the economic constitutional model for mobility of minimum salary, faced to the congealing of public salaries as an economic mechanism for the reduction of fiscal deficit. In order to explain this type of unconstitutionality strictly related with the economic analysis of law, the author makes a brief study of what an economic model constitutes, and then he elaborates a theoretical explanation of the concept of incommensurability, and incommensurability of economic models. Later on, he develops a review of the economic models that inspire the public salaries constitutional and legal regulation and the environmental policy instruments, focusing in the current legislation and concluding with the explanation of the incommensurability in economic models applied to the cases in the actual legislation.