Here is a video I founded on Loic Lemeur's blog. This is pretty amazing to see and to understand, especially if you manage people. Indeed, knowing the component of people's motivation will allow you to get the best out of them, and hence to achieve great performances.
Now the results are not really what you would expect...
Actually, you could also use the results of this study to apply it into your customer relationship management program. Your customers are people, and they don't necessarily only look after the cash back they could get for being loyal. Sometimes, some other kind of incentives are perceived more valuable that simple money.