This question is not as trivial as you may think. These days, employers recognize that even in this tight employment market, there are many people who will leave a good job for better money, benefits and job growth opportunities. So, even though you may not say so, your employment history and the companies you have worked for might provide some indication that the money is important, even if you don’t specifically say so. Nonetheless, if asked, you should say that the type of job and the quality of your work is your motivation. Talk about how important your work is to you, and the pride you put into your efforts. You hope that through hard work and job growth the money will improve. Tell your interviewer about times when your job was most satisfying and fulfilling, and give specific examples that express that satisfaction and pride.