The Nation Newspaper. Olu, has urged the Chartered Institute of Stockbrokers (CIS) to deepen capital market participation, promote. Sanwo-Olu gave the assurance at the weekend, when the Institute's president and chairman of Council, Dr Fiona Ahimie, led a delegation of principal officers on a courtesy visit. Nigeria’s ambition to build a $1 trillion economy will depend less on rising tax collections, government revenue.