Nigeria's central bank raised its main lending rate for the fourth straight time to 16.50% from 15.50% on Tuesday as policymakers seek to rein in inflation slowing economic growth ahead of elections next year, Reuters reported. Inflation and the state of Africa's biggest economy will be major issues when voters choose a successor to President Muhammadu Buhari, who will step down after the February polls. Nigeria continues to face inflationary headwinds, which analysts expect will be worsened by the impact of floods on food prices and from a weakening exchange rate. "In our view, with significant pressures ahead – tighter global conditions, the risk of slowing global growth, weaker oil prices and pressure on FX reserves, FX reforms are more important than ever," said Razia Khan, Standard Chartered managing director and chief economist, Africa and Middle East. Annual inflation quickened to 21.09% in October, driven by rising prices of staples like bread, rice and maize and the cost of diesel, which is used to generate power. That prompted nine of the 11 members of the central bank's monetary policy committee (MPC) to vote for a 100-basis-point increase, while two voted for a 50-basis-point hike, bank governor Godwin Emefiele told a news conference. "We believe that at 21.09% inflation is already hurting growth," he said, adding that loosening the policy had not been considered. Nigeria's third quarter gross domestic product figure is expected later this week. GDP grew 3.54% in the second quarter this year, down from 5.01% in the same period last year. Read more.