With a timid voice and idolizing eyes, the little boy greeted his father as he returned from work, "Daddy, how much do you make an hour?"  

Greatly surprised, but giving his boy a glaring look, the father said: "Look, son, not even your mother knows that. Don't bother me now, I'm tired."  

"But Daddy, just tell me please!? How much do you make an hour," the boy insisted.  

The father finally giving up replied: " Twenty dollars per hour."  
"Okay, Daddy? Could you loan me ten dollars?" the boy asked.  

Showing restlessness and positively disturbed, the father yelled:  
"So that was the reason you asked how much I earn, right?? Go to sleep and don't bother me anymore!"  

It was already dark and the father was meditating on what he had said and was feeling guilty. Maybe he thought, his son wanted to buy something.  

Finally, trying to ease his mind, the father went to his son's room.  
"Are you asleep son?" asled the father.  
"No, Daddy. Why?" replied the boy partially asleep.  
"Here's the money you asked for earlier," the father said.  

"Thanks, Daddy!" rejoiced the son, while putting his hand under his pillow and removing some money.  

"Now I have enough! Now I have twenty dollars!" the boy said to his father, who was gazing at his son, confused at what his son just said. "Daddy could you sell me one hour of your time?"