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Business reporter, BBC News
It is too early to know which economic scenarios will prove correct, says the chief economist.
The global economy is facing its gravest threat since the financial crisis, according to the Organisation for Economic Co-operation and Development (OECD), and it could actually contract in the first quarter of this year.
The Paris-based policy group has cut its forecast for global growth to 2.4% this year - the lowest since 2009 and down from its previous forecast of 2.9% in November.
It said prospects for China "have been revised markedly, with growth slipping below 5% this year, before recovering to over 6% in 2021, as output returns gradually to the levels projected before the outbreak".
The UK is now expected to grow by 0.8%, the OECD said, down from its previous forecast of 1%, while its forecast for the US has been cut to 1.9% from 2%.
The OECD has also urged governments and central banks to take action to try to avoid a bigger impact.