CHIJIOKE OHUOCHA NIGERIA'S central bank has sold around $50 million to foreign investors on the spot and forward markets, in what the bank called a test trade to gauge the level of dollar demand on the currency market, traders said on Wednesday. Nigeria’s central bank has sold around $50 million to foreign investors on the spot and forward markets, in what the bank called a test trade to gauge the level of dollar demand on the currency market, traders said on Wednesday. The central bank has gradually restarted dollar sales after it halted supplies following a coronavirus-induced lockdown to slow…