In the most basic Diamond-Mortensen-Pissarides (DMP) model we have the variable $V$ which represents the present discounted value of expected profits from a vacant job. The corresponding Bellman equation is
$rV = -pc + q(\theta)(J-V)$
Where $pc$ is the cost of a vacant job per unit of time, $q(\theta)$ is the rate at which vacancies are filled and $J$ is the present discounted value of expected profits from an occupied job. If I think of a vacancy as an asset for the firm the Bellman equation makes sense but how can a vacancy be an asset?
What I don't understand is the intuitive meaning of $V$. How can a vacant job result in profits for the hiring firm? Furthermore, my textbook says
In equilibrium all profit opportunities from new jobs are exploited, driving rents from vacant jobs to zero. Therefore the equilibrium condition for the supply of vacant jobs is $V=0$
Again, how are there 'rents' from having a vacant job?