A useful reserve currency must be limited in supply, but have sufficient elasticity to satisfy the large, unpredictable needs that may arise in a turbulent financial world. Above all, confidence in its stability and availability must be maintained, which highlights the practicality of a national currency, or perhaps a variety of national currencies.
有用的储备货币的供应应该是有限的，但同时必须具有充分的弹性以满足动荡的金融世界所产生的大规模不可预期的需求。最重要的是，对储备货币稳定性和可获得性的信心不能削弱，这凸显了国家货币（也可能是一揽子多个国家的货币）的可操作性。