The shock that coronavirus has wrought on markets across the world coincides with a dangerous financial backdrop marked by spiralling global debt. According to the Institute of International Finance, a trade group, the ratio of global debt to gross domestic product hit an all-time high of over 322 per cent in the third quarter of 2019, with total debt reaching close to $253tn. The implication, if the virus continues to spread, is that any fragilities in the financial system have the potential to trigger a new debt crisis.

In the short term the behaviour of credit markets will be critical. Despite the decline in bond yields and borrowing costs since the markets took fright, financial conditions have tightened for weaker corporate borrowers. Their access to bond markets has become more difficult. After Tuesday’s 50 basis-point cut, the US Federal Reserve’s policy rate of 1.0-1.5 per cent is still higher than the 0.8 per cent yield on the policy-sensitive two-year Treasury note. This inversion of the yield curve could intensify the squeeze, says Charles Dumas, chief economist of TS Lombard, if US banks now tighten credit while lending has become less profitable.

This is particularly important because much of the debt build-up since the global financial crisis of 2007-08 has been in the non-bank corporate sector where the current disruption to supply chains and reduced global growth imply lower earnings and greater difficulty in servicing debt. In effect, the coronavirus raises the extraordinary prospect of a credit crunch in a world of ultra-low and negative interest rates.