“Job killing regulations” is an epithet commonly heard this year, with unemployment at persistently high levels and a presidential election cycle just completed. Many politicians and media commentators have come to accept this phrase as axiomatic, and for them, it is a convenient shorthand for what they believe is a major cause of current high unemployment rates and the economic downturn. To provoke critical commentary on this widely accepted assumption, the Penn Program on Regulation (PPR) recently convened a conference to examine two simple questions: “Do regulations kill jobs?” and “How do we know?” At the conference, scholars, government officials, and private-sector representatives met to exchange views on what research currently has...