Average organizational size has declined sharply over the last thirty
years in the American economy. This article documents this trend and e
xamines a number of factors that may have produced if, including downs
izing, sector shifting, and resource partitioning. It concludes that m
ost of the decline in average firm size is attributable to the shift f
rom manufacturing to services. This development presents important new
challenges to management that vary according to the growth patterns o
f each industry.