Nigeria has sharply devalued its currency for the second time in eight months, as the west African country bids to clear up its messy system of exchange rates and attract investment to its flailing economy. The naira has tumbled this week after the methodology used to calculate the official exchange rate was changed, taking the currency closer to the black market rate. Charlie Robertson, head of macro strategy at asset management firm FIM Partners, said the new methodology could help Nigeria attract more investment as it essentially abolishes the multiple exchange rates that frustrated investors. “It could take months but there could be more dollars swirling around in Nigeria now that the currency is officially very cheap,” Robertson said.

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