Peter has been successfully classically conditioned to no longer fear rats. It goes great for a while, with the sight of a rat leading to no response after several exposures. But then, Peter has a negative fear reaction to a rat that takes him by surprise. This phenomenon is called:

competition i thin

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

if im not mistaken its a. collective emotional arousal