In every presentation of information about economical phenomena there are always things which are understated differently by different people. This is determined by two factors: firstly, different intelligence, cultural experience, age, profession etc. of the people, secondly, different understanding of vocabulary (meaning of concepts). Thus, there is a difference between "knowing what it is" and "knowing about what it is". A rumour is a means of not official communication and is concerned with not knowing what it is but with trying to explain "knowing about what it is", on the grounds of not so much verified facts but rather on the feelings and speculations, put into a daily garment of understanding of concepts and information, adding, giv...