This change has the potential to cause displacement of long-time residents and businesses . In the US, the Centers for Disease Control and Prevention report Health Effects of Gentrification defines the real estate concept of gentrification as 'the transformation of neighborhoods from low value to high value.

Once this process of 'gentrification' starts in a district it goes on rapidly, until all or most of the original working-class occupiers are displaced and the whole social character of the district is changed. Shabby, modest mews and cottages-two rooms up and two down-have been taken over, when their leases have expired, and have become elegant, expensive residences . One by one, many of the working class neighbourhoods of London have been invaded by the middle-classes-upper and lower. She used it in 1964 to describe the influx of middle-class people displacing lower-class worker residents in urban neighborhoods her example was London, and its working-class districts such as Islington: British sociologist Ruth Glass was first to use 'gentrification' in its current sense. In England, landed gentry denoted the social class, consisting of gentlemen (and gentlewomen, as they were at that time known). The word gentrification derives from gentry-which comes from the Old French word genterise, 'of gentle birth' (14th century) and 'people of gentle birth' (16th century).

Historians say that gentrification took place in ancient Rome and in Roman Britain, where large villas were replacing small shops by the 3rd century, AD. Symbolic gentrification in Prenzlauer Berg, Berlin 8.5 ink! Coffee Protest (Denver, Colorado).2.2.1.5 Changes in demographic and consumption patterns.

2.2.1.4 Falling profit and the cyclical movement of capital.

2.2.1.3 Spatial centralization and decentralization of capital.

However, some view the fear of displacement, which dominates the debate about gentrification, as hindering discussion about genuine progressive approaches to distribute the benefits of urban redevelopment strategies. In extreme cases, gentrification can be brought on by a prosperity bomb. In addition to these potential benefits, gentrification can lead to population migration and displacement. Further steps are increased investments in a community and the related infrastructure by real estate development businesses, local government, or community activists and resulting economic development, increased attraction of business, and lower crime rates. The gentrification process is typically the result of increasing attraction to an area by people with higher incomes spilling over from neighboring cities, towns, or neighborhoods. Gentrification often sees a shift in a neighborhood's racial or ethnic composition and average household income as housing and businesses become more expensive and resources that had not been previously accessible are extended and improved. Gentrification often increases the economic value of a neighborhood, but the resulting demographic displacement may itself become a major social issue. It is a common and controversial topic in urban politics and planning. Gentrification is the process of changing the character of a neighborhood through the influx of more affluent residents and businesses.

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