Today, people rarely use cash at all. We use credit and debit cards, Venmo, Paypal, Cash App, wire transfers, money orders, checks, and more. Again, the value does not exist in any of these mediums. The value is merely exchanged through them as mediums. Mediums of exchange are not necessarily stores of value, though cash is an example of both. Similarly, something does not have to be functional as a medium of exchange in order to serve as a store of value, but it helps if the store of value can at least somewhat easily be converted into a form of money that might serve as a superior medium of exchange.