Professional and business services have long been identified with the downtowns of cities like New York, Chicago and San Francisco, where lawyers, accountants and architects are thick on the ground. However, in recent years there's been a clear shift in the geography of this vital sector, with some of the strongest job generation emerging far from the high-rise canyons. This shift is of profound importance given that professional and business services is by far the largest high-wage job sector in the U.S. and one of the main ladders to the middle class, with an annual average salary of $60,446, compared to $48,115 a year for the average nonfarm job.
