If this occurs primarily in the nearby area, it corresponds to what drops in a river do.That is to find the best possible way of realization for the entire river, which transports large amounts of water into distant areas. In addition evaporating water brings the required rain elsewhere. It is therefore very likely that the overall result is the best possible solution. But this does not exclude comparatively rare singular exceptions. However, the latter ones can not be part of a routine procedure, but only the consequence of discontinuous boundary conditions. Behind this statement, which is derived from mathematics, all unforeseen events are concealed without further specification. In life, they are called birth and death, in nature creation and vanishing.

A population within a society also has three parts comparable to the three phases of water. Some people like to live in their own homes settled in one place, others more mobile somewhere in the country rather as tenants, and we should not forget those who, for whatever reason, live scattered in the world, there also being useful for their home country, what hardly has something to do with tourism.

These three groups are supposed to form together a community and to understand one another in dynamic interaction. But any community needs some kind of limiting borders, and such dynamic interaction is only possible with a certain degree of permeability.