"Daddy, How Much Do You Earn Per Hour"

Daddy, how much do you earn per hour?
asked the child in a timid voice as his father came back home from work.
With a harsh tone, the father replied:
- Listen son, those are matters that not even your mother knows about.

- Don't bother me. I am very tired.
But Daddy, the child insisted, please tell me how you earn per hour.
This time the father's reaction was less harsh and said: $ 8 per hour.

- Daddy, may I please borrow $4 dollars? asked the child. 
The father got angry and spoke to his son:
- So that was the reason why you wanted know how much I earn.
- Go to sleep and don't bother me, you selfish child.
During the night, the father was meditating about the incident and started to feel guilty. Maybe his son needed the money to buy something very important.
Then, wanting to put his conscience to rest, he went to his son's room and speaking in a low tone, asked his son:
- Are you asleep, son?
- No Daddy, he responded half asleep.
- Here's the money that you asked me for, said the father.
Thank you Daddy, said the child. At this point, he reached under his pillow and took out some coins.
- Now I have enough Daddy. I have $8 dollars.
- Would you sell me one hour of your time?...said the child.