Confidence indicator is a measure of the mood of consumers or businesses. It is usually based on a survey during which respondents rate their opinion on different issues concerning current and future conditions. There are many kinds of confidence indicators as institutions measuring them use different questions, sizes of samples or frequency of publications. Consumers opinions are typically expressed with answers like: better, same, worse or positive, negative and unchanged. Results of such surveys are calculated by subtracting the negative replies from the positive ones. Business confidence indicator is closely linked to corporate spending and correlated with employment, consumption and investment. Therefore it is carefully watched as an indication of possible changes in the overall economic growth.