In their research paper "Beauty, Productivity, and Discrimination: Lawyers' Looks and Lucre" [Journal of Labor Economics, 16(1) (January 1998): 172-201], economists Jeff Biddle and Daniel Hamermesh examined the earnings and job placement of a large sample of lawyers. Their research data included objective ratings of the lawyers' looks. The research found that attractive lawyers earned more than other lawyers. Why might better-looking attorneys earn more?