It's wrong to not fully complete a job.
Calvin is a contractor that is doing a high paying job for a client and has another job lined up afterwards.
Calvin wants to move on to the next job.
Calvin makes sure to do his best work for the current client before starting the next job.
Calvin takes shortcuts on the current job, so he can get to the next one faster.
Calvin's reputation begins to precede him, and he finds himself never short of work or clients.
Calvin shoddy work does not hold up and the original client sues him over it.