You aren't just getting a salary, there should be other benefits associated with the job: health care (hopefully), vacation, maybe a laptop and a cellphone, 401(k) contributions, commuting expenses, etc. Find out when your next salary review will be. A good health care package with a choice of doctors might be worth a lot to a employee with a young family, but three weeks vacation is what a single guy wants. When the offer is made, make sure you understand what else there is besides salary and ask questions if you are unsure. It's ok to ask to talk to the HR (Human Resources) people if your future boss isn't sure about the details.
