Its exports don't face the same currency barriers that confront many other countries, which have to pay a premium to buy dollars in which to trade.
其他国家的出口需要支付溢价交换美元进行交易，而美国不存在这些货币障碍。
2
Over time, those items can command a premium in the secondary market, where members trade their goods for virtual currency.
一段时间后，这些物品逐渐在二级市场走俏，玩家们在那儿换虚拟货币。
3
When other countries must acquire your currency to trade, and must keep your money in reserve to protect the value of their own, your securities sell at a premium.