[phkahler]

>> People always seem to know why stocks move - after they have moved.

Hindsight is perfect, you just get all the survey results from the buyers and sellers and see what the common reasons for buying/selling were. Then you post an article before the closing bell that same day. Easy.

[SixSigma]

People think they know why they do what they do. But when you try and encode it, it fails.

I've worked with traders, trying to implement the system they think they use. They had a system of indicators and said they traded according to them but when applied mechanically to trading data it didn't make a profit.