A relationship between the work of the aggregate formation and the equilibrium aggregate concentration is established with allowances made for the mobility of molecular aggregates in a solution of a colloidal nonionic surfactant. The relation between the intensities of emission and absorption of surfactant monomers by the aggregates is found. A kinetic equation of the formation of molecular aggregates is obtained. Conditions of aggregation/disaggregation processes are revealed. Kinetic substantiation of the irreversible tendency of a solution to the aggregation equilibrium is given.