[dpark]

I generally agree with what you've written there. I think we're mostly arguing shades of gray.

On the topic of the efficient market hypothesis, there was a paper published a while back that purportedly disproved the hypothesis in the general case (basically, the potential number of data points can grow larger than the available computational/cognitive power of the market). I'll see if I can dig that up later. I think specific cases could potentially still hold, though, at least theoretically.

[joshu]

A long time ago someone came to present a paper to us that showed that people trading without information (eg momentum traders you mentioned above) impact the stock price much less than those trading with information. So I suspect that the more people know the more efficiently they themselves move the market. This might solve the "too much information" paradox you mention...