Chewing gum (as in, a chewy substance you chew for the sake of chewing) was discovered/invented a long time ago, probably before money. It was a naturally-occur

Chewing gum (as in, a chewy substance you chew for the sake of chewing) was discovered/invented a long time ago, probably before money. It was a naturally-occurring part of the tree. If you mean modern chewing gum, it had to differentiate itself from the previous iteration of chewing gum.