Internet platforms that match buyers and sellers of personal services suffer from a lack of data. In Innovation Files, Joe Kennedy reviews findings from two papers coauthored by Alan Krueger. The first updates survey data on alternative work arrangements. These arrangements continued to increase over the last decade, rising from 10.1 to 15.8 percent of the workforce. While independent contractors are still the largest category, temporary, on-call, and contract work has also risen rapidly. The second paper finds that Uber drivers spend more time and drive more miles with a passenger in their car than do taxi cabs.