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We consider properties of the measurement intensity $\rho$ of a randomvariable for which the probability density function represented by thecorresponding Wigner function attains negative values on a part of the domain.We consider a simple economic interpretation of this problem. This model isused to present the applicability of the method to the analysis of the negativeprobability on markets where there are anomalies in the law of supply anddemand (e.g. Giffen's goods). It turns out that the new conditions to optimizethe intensity $\rho$ require a new strategy. We propose a strategy (so-called$\grave{a}$ rebours strategy) based on the fixed point method and explore itseffectiveness.

The intensity of the random variable intercept in the sector of negative probabilities