Abstrakt:
Financial management uses the fundamental methods or the technical methods in a firm's financial analysis and management. If we can accept a condition "ceteris paribus", we will try to use an accurate and methodically sophisticated method - mathematical modelling. This article shows the application of a chosen mathematical model in management of specific but for long-time firm's existence a very important problem: the relation between the real growth rate (RGR) and sustainable growth rate (SGR). This model is elaborated with data of one of the Czech small spa firms.