Other than its simplicity and brevity, I don't get how the book "Caps for Sale" is for kids. It's the story of this hat salesman who's having a slow day selling hats in town, so he decides to go out to the countryside. He walks out past the edge of town, past churches and houses, and when he tires himself, finds a tree to nap on.
Oh, he has this big tall stack of caps on his head that are arranged by color; that's an important part of the story.
Anyways, man goes down for a nap against the tree. When he wakes up, he finds that only his cap remains on his head. His cap is a checked cap.
He's way confused. As the book goes, "he looks to the right. He looks to the left. He looks behind the tree. No caps."
But then he looks up - into the tree. "And what do you think he saw?", goes the children's book.
Welp, there's a bunch of monkeys in the tree who are all wearing his caps.
Actually, since we know "his" cap remained on his head, the story seems to distinguish between "his" caps and the caps he was selling. It could be assumed, then, that these caps aren't even his. Perhaps he's selling them for another. Perhaps he himself took them from someone else. We cannot know.
The man gets very angry. After a few rounds of looking at the monkeys and wagging his fingers while imploring the monkeys to give him back "his" (again, "he" has "his" checked cap still on "his" head at this point), the monkeys don't give up the caps.
Finally, man gets very angry. Instead of wagging his fingers, he shakes his fists very animatedly and essentially screams at the monkeys to give "him" back "his" caps. They finally give them back.
All the caps come flying down out of the tree. We see the man pick them all up and stack them back on "his" head in a color-coded fashion. Man walks back to town all happy and satisfied calling, "Caps! Caps for sale. Fifty cents a cap."
If one is to expect a lesson from a children's book, the lesson seems to be clear in "Caps for Sale":
When you do not get what you want, get "really, very, very angry" and it shall come down to you from on high.