"Tourism is one of the major sources of income for a city. It can increase the quality of life by increasing employment, but after certain threshold tourism overflow (see carrying capacity) can cause damage to an area.
This damage can affect the geography, the quality of life and costs such as rents. Due to seasonal jobs and unexpected market changes, tourist flows are unforeseeable.
Local and regional municipalities can try to dampen and regulate tourist flows to find a social optimum, but how is that optimum calculated? And who is then meant by 'society', when the numbers of incoming tourists outweigh the number of its residents?"
'Sustainability focuses on meeting the needs of the present without compromising the ability of future generations to meet their needs.'
The concept of sustainability is comprised of three pillars: economic, environmental and social - also known informally as profits, planet and people. Sustainability emerged as part of corporate ethics in response to perceived public discontent over the long-term damage that a focus short term profits can cause.
Sustainable tourism is one that respects culture and traditions; environmentally friendly transit; and which has a positive social impact. Tourism always involves some sort of travel-related negative externality such as littering, CO2 emissions, social disruption these tendencies are especially significant in Venice. A perfectly sustainable tourism would ideally be based on the concept of circular economy in which all trash is transformed into re-usable resource and the increase in tourism flow would be strongly positively correlated to the labor market for the local economy."