Found this dope post on Freakanonimcs.com

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by: Stephen J. Dubner

The following is a cross-post from NFL.com, where we’ve recently launched a Football Freakonomics Project.

Today’s question on “Football Freakonomics” is a tricky one. Which incentive is stronger for an NFL player: landing a big contract or winning the Super Bowl?

It can be devilishly hard to find out what truly motivates people to do what they do. There are a lot of reasons for this. Different people have different preferences; an incentive that works for a while may wear off over time; and it’s dangerous to rely on what people say about their motivation, since most of us are concerned about saying “the right thing.”

It’s better, therefore, to measure actual behavior – in this case, for instance, how players perform before and after signing a big contract.

checkout the rest of the article here.