Answer:
The author decided to call the story "loser" because this is a name that has a great impact on the life of the protagonist and the story as a whole.
Step-by-step explanation:
Hello. I believe you are referring to "Loser" written by Jerry Spinelli. In this book, the author tells the story of Zinkoff, a very brave, friendly and lively boy, who becomes the target of constant jokes and intimidation at the school he attends.
Zinkoff is a boy who has problems of high conscience and despite being very kind he is very clumsy, has difficulties in socializing and has very low grades, which makes all teachers and friends at school see him as a "loser", in the most perjorative sense of the word. However, one day, when he loses a competition at school, all the kids start calling him a "loser", now that he literally is one. The problem is that this nickname has made him the constant target of jokes, intimidation, disaffection and abuse, which accompanied him throughout his childhood and adolescence. The word "loser" started to define Zinkoff for all people and for that reason, the author decided to name the story with that name, since it is something that defined the character in a very impactful way.