There has been an edible coin since the ancient ages: salt. In fact the word "salary" comes from the Latin "salarium" as salt was used as means of payment and store of value.
Endorsed because salt is indispensable for the human body. In some countries, even the government controls the sale of salt and prohibits individual sales.The above friend's assumptions are very interesting, but they are too complicated. It seems difficult for most people to accept and reflect the value!
