This paper provides estimates of the private financial return to education based on large samples of monozygotic (MZ) and dizygotic (DZ) twins which we obtain from Danish population registers. Our estimation exploits the fact that our data is a long panel. We show that the rising inequality,...

A variety of public campaigns, including the “Just Say No” campaign of the 1980s and 1990s that encouraged teenagers to “Just Say No to Drugs”, are based on the premise that teenagers are very susceptible to peer influences. Despite this, very little is known about the effect of school...