In addition to that I would add it needs to be a real store of value. Over any moderate timescale (a few years, say), it should reasonably maintain its value over that period. Swings of 40% purchasing power are unacceptable for a useful currency.
Sure, bitcoin maximalists love to point out that if you bought it a year ago, it's up XXX%. But what if I bought near its high value? Not so good a proposition then.
Sure, bitcoin maximalists love to point out that if you bought it a year ago, it's up XXX%. But what if I bought near its high value? Not so good a proposition then.