黑市汇率是在外汇黑市市场上买卖外汇的汇率。在严格实行外汇管制的国家，外汇交易一律按官方汇率进行。一些持有外汇者以高于官方汇率的汇价在黑市市场上出售外汇，可换回更多的本国货币，而这是黑市外汇市场的外汇供给者；另有一些不能以官方汇率获得或获得不足够的外汇需求者便以高于官方汇率的价格从黑市外汇市场购买外汇，这是黑市外汇市场外汇的需求者。
然而这会使其它人走向黑市或海外市场，这样就会更加削弱官方汇率的可信度。
This, however, may push others towards the black market or offshore, further undermining the credibility of the official exchange rate.
越南盾已跌破官方汇率，仍在不断下滑，并使得黄金和黑市美元蓬勃发展。
Vietnam's currency is consistently falling below the official exchange rates, creating a thriving black market for gold and dollars.
在黑市上，苏丹磅兑换交易比官方汇率低60%之多。
On the black market the pound is trading as much as 60 percent below the official rate.
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