-Gold is usually volatile. The cost of gold can go up and down rather considerably over small periods of time, which implies it will not be suited to investors who're risk-averse or have a brief time horizon right up until retirement. Ch?a có nghiên c?u nào v? t??ng tác c?a s?n ph?m v?i các lo?i thu?c hay th?c ph?m ch?c n?ng khác. N?u s? d?n