The profitability of almost any business can be significantly increased, sometimes by tens of percent, and this can be done almost without cost, with low-budget means, by using hidden business opportunities. The book discusses specific methods and techniques for solving this problem - increasing the effectiveness of advertising , finding the best price, repeat sales, reducing costs and increasing the check amount. It will be of interest to owners and managers of small and medium-sized enterprises, branch networks, as well as employees of advertising, sales and marketing departments.