It is very difficult to teach such topics. because being rich and poor are relative terms.
One day, when we were taking Chirag for a funfair, on our way, at the signal post some of the beggers came to ask for money. We didn't offer any. on the next signal post, some kids came with huge hydrogen gas filled balloons and showed them to Chirag so he will ask us to get them.. but soon the signal was clear and we rushed to the fair. he enjoyed there. there were lots of rides, and fun things. there were huge H2 gas filled baloons for sale. They had various character's shapes. Chirag wanted to have one. The smallest of them was for Rs.500/- so, I just commented - I don't have money for your baloon! He did'nt isist.
On our way back. He saw the same kids with many ballons in thier hands to sale. so he asked me,'' Mom, these kids are very RICH.. they have so many baloons! I said they are selling them to get money. he said, they already had money to buy baloons, still why do they want more money?
any time, he saw taxi driver giving change (Coins) he thought, taxi driver is rich. and while reciving the money, he said, mom, we are becoming rich now..look so many coins in my hand!!