Q&A about the gratest power

Q1: Why did Ping invite children to the palace instead of adults?

I think it's because children are more creative and imaginative,and Ping himself is also a child ,too.

Q2: All the children were competing to be the one chosen to be prime minister. Why were the children working with each other instead of competing with one another?

Maybe they're work with their friends ,so that when one of them been chosen their friend can be theprime minister,too!