Answer:
Kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all. What am I?
Break me and I am better, immediately set and harder to be broken again. What am I?
I must be broken before you can use me. What am I?
Flat as a leaf, round as a ring; have two eyes, can't see a thing. What am I?
Of these things - I have two. One for me - and one for you. And when you ask about the price I simply smile and nod twice.
The answer I give is yes, but what I mean is no. What was the question?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic