Your son is a smart kid. Setting up his own flea market right in the house is amazing.
But a key part in his learning is what you and your wife showed which i admire alot.
His mother and I then entered the room, pretending to be various, different individuals, and bought some of the toys using real Japanese yen.That is the point where i see him learning. Learning counting and even customer satisfaction in a little way. *Amazing parents you are. Thanks for educating that great young man.
Thanks so much!