Ginseng Decoction

A youngster from a rich family saw a poor porter lying on the ground as he was walking along the road one morning. He asked the onlookers, "Why is this man lying here?"
Someone answered, "He had no food to fill his stomach and is so hungry that he is lying on the ground to catch his breath."
The rich youngster said, "Since he has nothing to eat? why didn't he have a cup of ginseng decoction before leaving home in the morning? This would support him for half a day."