NIGERIA'S incoming President Bola Tinubu will inherit anaemic economic growth, record debt and shrinking oil output, but before he can start fixing these pressing problems he will need to secure public support for painful decisions. Life is tough for citizens of Africa's biggest economy, and a tangle of protectionist economic policies and foreign currency interventions have spooked investors. An attempt by Nigeria to reduce hugely expensive fuel subsidies a decade ago met with mass public protests and had to be dropped. Tinubu, a member of President Muhammadu Buhari's All Progressives Congress, helped propel the outgoing president to power in 2015.…