A good’s salability across time refers to its ability to hold value into the future, allowing the holder to store wealth in it. For a good to be salable across time it has to be immune to deterioration.
Similarly, with money, it was inevitable that one, or a few, goods would emerge as the main medium of exchange because the property of being exchanged easily matters the most. A medium of exchange is not acquired for its own properties, but for its salability.
Monetary status is a spontaneously emergent product of human action, not a rational product of human design.
"I think the next best thing to solving a problem is finding some humor in it." -Frank Howard Clark