Nigeria’s economy may struggle to rebound from its worst slump in 25 years unless President Muhammadu Buhari can end an armed conflict in the nation’s oil-producing region and fix a currency policy that’s blocked investment. Pipeline attacks in the Niger River delta cut oil production by a third last year, slashing government revenue, while central bank intervention and trading restrictions that prop up the value of the naira have stymied trade and investment. A more favorable oil and foreign-currency environment could help the economy expand, analysts say. The International Monetary Fund estimates gross domestic product contracted 1.5 percent in 2016. “It’s oil prices and production from the delta that will determine growth,” Ogho Okiti, chief executive officer of Time Economics Ltd., said on Wednesday from Abuja, the capital. “When monetary authorities floated the naira, they expected fiscal policies that attract investment and boost activity. But that didn’t happen, and […]