informed trades vs non-informed trades.

A more plausible story is the following: if Black’s idea is correct

and the uncertainty in the fundamental value is large, then

the amount of information contained in any given trade is necessarily

small.

 

9 Furthermore, modern electronic markets are anonymous,

which makes it impossible to distinguish potentially informed

trades from non-informed trades. Hence, all trades are equivalent

and they must (statistically) equally impact on prices.

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