I wouldn't say zero! Also, moving forward things like planetary resources could challenge the stability of gold, but it's still pretty good and fairly liquid. For me, it proved more liquid than bitcoin; Exchanging bitcoin took 3 days coinbase + ACH; I liquidated a gold piece in an afternoon, could have gotten cash, but mailed a check into my bank and had the funds in 2 days (still faster than bitcoin, even with the USPS in the way)