Abstract
The main goal of this article is to show how much complicated is the process of building portfolio in behavioural approach. This approach is strongly connected with multitasking because of fact of conflicting goals in the making decision process. The graphic interpretation of the influence of the changes in investor's preferences on the utility curve will be analysed in this paper. The perspectives theory by Kahneman and Tversky is the base of methodological considerations included in this work.