The article reviews the issue of usage of such retail business indices as the commodity stock turnover and the average trade margin for calculation of effectiveness of investments in new businesses or in development of the existing one. The example for calculation of NPV and the investment payback period on markets of fast-moving consumer goods with the high turnover speed (so-called FMCG markets) by the dynamic method via entry of the commodity stock and the average trade margin into the formula for the turnover coefficient.The conclusion is made of practicability of such approach for commercial enterprises of small and medium business. This study will be of interest for owners of small and medium business enterprises, their general and financial directors, as well as for researches who study issues of the administrative analysis and forecasting.