There is a substantial body of research in economics and sociology suggesting that personal
contacts are widely used as a method to ﬁnd jobs. This study investigates how a worker’s labor
market outcomes are related to the gender of the person who refers the worker to his or her job.
Data from the National Longitudinal Survey of Youth show that information networks are highly
segregated by sex. A significant majority of the men who use contacts use male contacts, and a
significant majority of the women who use contacts use female contacts. In addition, it is found
that both men and women who use male contacts have significantly higher wages than those who
do not use contacts, and men who use female contacts have signiﬁcantly lower wages than those
who do not use contacts. It is possible that individuals who use female contacts possess other
unobservable characteristics that make them less likely to succeed and individuals who use male
contacts possess other unobservable characteristics that make them more likely to succeed. This
concern is addressed with two econometric models that control for possible endogeneity. First,
an instrumental variables technique is used. The presence of siblings and working siblings are
used as instruments. Next, a three equation maximum likelihood method that explicitly models
the correlation between the errors in the contact and wage equations is used. Corrected results
from both methods are consistent with the ordinary least squares results.