In the United States, redlining is the practice of denying services, either directly or through selectively raising prices, to residents of certain areas based on the racial or ethnic makeups of those areas. While some of the most famous examples of redlining regard denying financial services such as banking or insurance, other services such as health care or even supermarkets, can be denied to residents to carry out redlining. The term ""redlining"" was coined in the late 1960s by John McKnight, a sociologist and community activist. It refers to the practice of marking a red line on a map to delineate the area where banks would not invest; later the term was applied to discrimination against a particular group of people (usually by race or sex) irrespective of geography.During the heyday of redlining, the areas most frequently discriminated against were black inner city neighborhoods. For example, in Atlanta in the 1980s, a Pulitzer Prize-winning series of articles by investigative-reporter Bill Dedman showed that banks would often lend to lower-income whites but not to middle- or upper-income blacks. The use of blacklists is a related mechanism also used by redliners to keep track of groups, areas, and people that the discriminating party feels should be denied business or aid or other transactions. In the academic literature, redlining falls under the broader category of credit rationing.Reverse redlining occurs when a lender or insurer targets nonwhite consumers, not to deny them loans or insurance, but rather to charge them more than could be charged to a comparable white consumer.