Just two years ago, Nigeria had the largest economy in Africa. But it has slipped to fourth due to currency devaluations. A sharp price jump in oil prices then added to the inflation rate, which disproportionately burdens the poor. Ridwan Karim Dini-Osman reports from Lagos that many Nigerians are calling on the country’s president to bring back fuel subsidies, even though it threatens to undo recent economic reforms.