It can hardly be viewed as a store of value. That requires at least a modicum of stability. Unlike the pound in my pocket, however, I can have no idea what a bitcoin will be worth tomorrow or in a year’s time. That, in turn, reduces its value as a unit of account. Why would another individual be prepared to accept my bitcoin for a good or service when its future value is so uncertain; for the same reason, why would I want to spend my volatile bitcoin rather than hoard it in the hope of further appreciation.