Definition for : Informational efficiency
Informational efficiency of a Financial system refers to the ability of a Market to fully and rapidly reflect new relevant informaow more. It constitutes a rational response to a problem of dissemination of information, provided the proportion of imitators in the group is not too high. See also Mimicry.
(See Chapter 15 The financial markets of the Vernimmen)
To know more about it, look at what we have already written on this subject