Urban Growth as a Function of Increased Work Stating this, Jacobs aimed to emphasize, that the grown-up cities started working primarily for export, as the number of visitors grew proportionally to the growth of the city sizes. It was stipulated by the fact, that the bigger a city was, the more merchants aimed to trade there, and the more merchants traded there – the wealthier and bigger the city became. Thus, it started working especially for export, as trading for export was the only source of income. Thus, all the other occupations became subsequent, and necessary only for the activity maintenance, such as food, tidying up the streets, building, etc. All these occupations were aimed to keep the growing tendency and attract as many merchants as possible, both from the other cities and abroad. One of the brightest examples is the growth is the ancient Slavic cities, like Rostov, Kyiv, or Constantinople – the capital of the Byzantine Empire. The definition of “complexity” here defines the amount and diversity of the probable occupations, as some particular cities may be famous for the variety of goods, the mastery of craftsmen, the beauty of architecture, and so on. As a rule – the capitals were usually famous for all the possible features, but everyone had their own particularity. Another fact that is necessary to mention is the unification of the cities. It means, that cities could unite for the common manufacturing of the goods: for example city A has high mastered potters, and city B has painters. Thus, these cities may unite and produce painted pottery, which is more expensive and precious. Moreover, some private masters may unite, thus gilds, trade unions, associations appear, and these associations issue the rules of production and trades, arrange all over trade crusades, and defend themselves from murders and rubbers. Taking into account the social value of labor division it is necessary to mention, that the processes that had been described above accelerated the social developments among peoples, and fostered civilized trade relations among merchants, craftsmen, and citizens. Human ecology is not just an alternative for, but an addition to, the other frameworks of orientation and methodologies of social examination. By providing some of the courage and much of the material and techniques suitable to the ordinary disciplines into the research of societal phenomena, human ecology has called concentration to the broad regions where communal life can correctly be studied as if the researcher was not an integral part of the monitored. The Division of Labor Corresponding to the Ecological Concept The literature of human ecology was much troubled with the difference between the society and the public. The former emphasized the symbiotic contacts, spatial and chronological measurements, physical arrangement, opposition, and the division of labor; the latter emphasized contacts, compromise, general standards, charges, mindful social control, and communal exploit. Unluckily these two idyllic-typical features of human communal activity have regularly been puzzled with particular actualities. Thus there has been a breakdown to regard that all communities are also societies an