Aesop used animals instead of humans and gave them human traits to teach the reader the moral of his fables in a non threatening way and to keep them interested without feeling like it relates to themselves. :)
Answer: the dependence of two or more people or things on each other.
Explanation: (Using context clues) we can see that it explains that he thinks we don't understand that we have to give to be able to take. This shows that we are depending on someone which could be one person or another nation.