Why is salt a symbol of wealth in mail

Salt was historically very difficult to get a hold of, due to lack of production & being expensive to buy! Many restrictions were placed on its creation.

the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.