This paper inquires into the existence of concentration in the service sector. The principal characteristics of the concentration process in the period 1969-2000 in forty 2-digit SIC service sub-sectors for the U.S. states are examined. A similar analysis is carried out for five service sectors for the U.S. counties. We detect that concentration clearly takes place in some service sub-sectors, the level of sectoral disaggregation is relevant and the concentration patterns are maintained over time without relevant changes.
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