SUMMARY
Study of urban stability shows that the special concern given to the problems of the commerce in urban structures is derived from the dominance of this functional element in the system of facilities and from its ability to put together economical, urbanising and social functions. That all enables to influence urban stability to a great extent. Economical essence of the commerce in a market economy and shift of the economical gravity center to the tercial sector bring not only positive effects but also problems and contradictions to the urban structure. Fixing of these problems needs special attention.