Traditionally financial behaviours are explained using demographics (e.g. age, gender) and economic factors (e.g. income). However, psychological factors should also be taken into account in explaining financial behaviours. Our presentation reviews the results of several studies, which correspond to these psychological factors, and which show how important it is to take them into consideration while trying to explain or understand financial behaviours. In the first part we present results of studies showing the importance of psychological factors, which explain financial attitudes and behaviours. Later we present results of an international study conducted in 19 countries, showing cross?national differences in financial attitudes and in the third part we show psychological factors, which underlie attitudes and behaviour connected to smart shopping.