Once a job offer is made, there is plenty of room for salary negotiation. Since one of the primary reasons for changing jobs is the desire for a larger income, the easiest way to ensure that you actually meet this goal is to do your research. Just remember that research isn’t limited to knowing what others in your field are earning, or arbitrarily deciding upon the magic amount that you would like to earn. (Here are four quick and easy ways to up your spending money. See Increase Your Disposable Income.)