Figure 1
The number of distinct occupations in US Metropolitan Statistical Areas vs. total employment.
(A) The relationship between the number of professions present for each city (orange dots) and city size is well described by 
, with d0 = 686, γ = 0.84, N0 = 1.48 × 105 (blue line). (B) D(Ne) at different labels of resolution of the occupational classification scheme, ri, with i = 6 the finest and i = 3 the coarsest. (C) d0 is proportional to 
across levels of classification scheme resolution and time, suggesting the there is a r-independent limit to the form of the occupational diversity of cities and that D is open-ended. In this limit, 
and larger cities are always more diverse as a whole, but more specialized per capita.
