Fig. 2.

Average wages for freelance workers with different kinds of human capital. Wages are calculated for all workers who average more than $1/h. Error bars are a 95% confidence interval on the point estimate. (A) Average wages for workers in different areas. (B) Average wages for workers qualified for jobs in different areas (we have omitted two categories with fewer than 20 workers). (C) Average wages for workers with different levels of skill diversity. (D) Average wages for workers with synergistic skills and those whose skills must be applied independently as a jack-of-all-trades.