Most of us (by which I mean me and the handful of people who regularly read my LJ) are, however much we may dislike the term, knowledge workers; many of us also manage other knowledge workers. And most of us — or at any rate, those with whom I have, over the years, had conversations about the subject — feel that, once you're making a decent living, money isn't anywhere near as good a motivator, for ourselves and those of our colleagues we respect, as upper management seems to think it is.
But until now I didn't know there was science to back that belief up. Indeed, science to show that financial incentives are in fact de-motivatiing for creative intellectual work.
Deniel Pink's TED talk. Ninteen minutes. Well worth watching.