The classical problem of product supply and demand, which was first defined by À. Marshall, is reduced to Lorentz model in a nonlinear statement and it describes sustainable circular processes of commodity market, including price range increment in the context of crisis forthcoming (inflation); destabilization due to nonmanufacturing costs; the main stages of crisis development, including a stage of chaotic behavior of residence time at each attractor (equilibrium point); possibility of surmounting the crisis by means of modification of certain parameters. The given approach is used for the purpose of construction of a qualitative model of commodity price readjustment during precrisis and crisis periods, and finding reliable prognostication time.