Your payoff from hiring a worker is the difference between the revenue increase from hiring a worker and the wage you pay that worker.
If you accept a job, your payoff is the wage you receive. If you do not accept a job, your payoff is the value from staying home.
Paying an $8 wage for a job that increases firm revenues by $13:
|Firm Payoff||=||Revenue Increase||–||Wage|
A worker who values staying at home at $6 and does not accept a job:
|Worker Payoff||=||Value of staying home|