EN
Praxeology is the science of the efficiency of actions. Between these science and various sciences, including economics there is a connection. In the literature there are several versions of the definition of financial investments. Profitability is one of the important characteristics of financial investments of firms. There are various values of efficiency of action: the efficacy, advantageousness, economic profitability and other values, eg. preparation and rationality. These values of efficiency of action can be referenced to financial investments of firms. There exists relation between the profitability of financial investments of firms and the listed forms of efficiency of these investments.