black market premium
noun[C]
MONEYukusthedifferencebetween thevalueofcurrencyon theblackmarket(=illegalsystem)anditsofficialexchangerate(=value)inrelationto anothercurrency:
If agovernmentallowshighinflation, a highblackmarketpremiumon thecurrency, and highbudgetdeficits, how willforeignaidhelp?