Global economic growth will sink to levels not seen in over a decade as the coronavirus outbreak hammers demand and supply, challenging central banks and governments to respond to a fast-changing situation, according to the OECD. As central banks around the world try to calm a market panic, the Paris-based group also warned of possible global contraction this quarter. It cut its full-year growth to just 2.4% from 2.9%, which would be the weakest since 2009.