According to erikson's psychosocial theory, the negative outcome of middle childhood is

The negative outcome is Inferiority.
During the middle childhood, children will tend to be constantly compared with other peers,whether using beauty, academic achievement, or physical prowess as a standard. This process of comparsion could lead to sense of Inferiority if the children never feel that he got any possitive value that favor them int the comparison process among other peers.

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.