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Definition: ABCD Countries
They are the categories of U.S. countries given by AC Nielsen Company which are based on the Census Bureau population of U.S. data and proximity to major metropolitan areas. A countries are the largest countries in the U.S. by population while the D counties have the smallest population. This classification of the countries is done on the basis of the data from the latest census. It takes place once in every 10 years.
A countries are the countries which are placed in the largest 25 metropolitan areas in the U.S., which have the highest density. B countries are those countries which are not the A countries but have a population which exceeds 150,000 or they are in a metropolitan area which has a population greater than 150,000. C countries are those which can not be classified as an A or a B county, but has a population more than 40,000 but lesser than 150,000. D countries are those countries which can not be classified either as an A or B or C county. It indicates that D countries have population of less than 40,000 peoples.
Advantages: This classification of the countries is useful for the marketing agencies, advertising agencies and advertisers for the preparation of advertising and an analysis of the media plans.
Disadvantages: This differentiation is based on the census which is valid for 10 years. The category of a country may change in this time which is not considered here.