Gentrification is a trend in urban neighborhoods, which results in increased property values and the displacing of lower-income families and small businesses. This is a common and controversial topic in urban planning. It refers to shifts in an urban community lifestyle and an increasing share of wealthier residents and/or businesses and increasing property values. Gentrification may be viewed as "correction" of blockbusting and urban flight as many gentrified neighborhoods of the present were once affluent neighborhoods of the past.