Well measure wealth can be tricky, but if you can afford a roof and food you can start thinking in giving zaps to people. but not before. I think we are going to experience to see a more natural movement of wealth from rich countries to poor countries as barrier are being removed. So going back to zaps, lets say you like a how a guy in the metro is dressed, and you zap him some sats, It depends of the wealth of this guy if he continues with this trend or maybe he will use it to buy his dinner.