A common assumption in equilibrium search and matching models of the labour market is that each firm posts a wage,to be paid to any worker hired.This paper considers the implications of firms posting contracts,in a random matching model with on-the-job search.More complex contracts enable firms to address both recruitment and retention problems by,for example,increasing the wage with tenure.The effect on tehe labour maket is to reduce turnover,below the level required for efficient matching of workers to firms.
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