This paper develops a search model with heterogeneous workers and social networks. High ability workers are more productive and have a larger number of professional contacts. Firms have a choice between a high cost vacancy in the regular labour market and a low cost job opening in the referral...

This paper presents a search model with heterogeneous workers, social networks and endogenous search intensity. There are three job search channels: costly formal applications and two costless informal channels – through family and professional networks. Our model explains a U-shape referral...