The basic building block for MSAs is the county, because of the ease of obtaining data.

Question

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MSAs (Metropolitan Statistical Areas) are defined by the US Office of Management and Budget (OMB) and are made up of one or more counties that have a high degree of economic and social integration. Counties are used as a basic building block for MSAs because county-level data is readily available from government agencies and can be easily analyzed to determine whether an area meets the criteria to be classified as a metropolitan area.

The Basic Building Block for MSAs Is the County, Because