Information cascade

PrepNuggets

An information cascade is similar to herding in that investors watch and follow the actions of other investors.  The difference is that the investors do not follow blindly, but make decisions which are influenced by the information from other investors.  

Some, however, argue that this may support the argument for efficient markets.  If those who act first are more knowledgeable investors, those who follow their actions may be part of the process of moving prices toward their intrinsic values, improving informational efficiency.