Jobs
From Prisonblock
This is a job you can take while working at the prison. They are accessed via the message board in the Prison Explore mode.
By taking a job, you'll get a certain payout of cash every day, depending on the job.
Jobs have stat requirements. You have to meet the necessary stat level of a certain job before you can take that job. As you train and raise your stats, your job level can increase also, which will increase your payout per day.