Abstract
This paper shows that adjustment costs modelled as firing costs of moderate size go a long way in explaining the variability and counter-cyclicality of the labour share at the firm and aggregate level. Firing costs cause firms to fire less in recessions and hire less in booms causing wage costs to fluctuate less cyclically than output, thus inducing variability and counter-cyclicality in the labour share. The paper develops a dynamic labour demand model with firing costs. The model is then calibrated using moments derived from 1634 French manufacturing firms and aggregate French manufacturing data. The calibrated model is able to closely match the variability and counter-cyclicality of the labour share at the firm level while it also generates a counter-cyclical aggregate labour share with a variability 60% of that in French aggregate manufacturing.
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