Americans now owe $1tn in credit card debt, and a roughly equivalent amount of student loans and auto­loans which, like the subprime mortgage quality that set off the 2008 financial crisis, are of largely low credit quality (and therefore high risk).

US companies have added $7.8tn of debt since 2010 and their ability to cover interest payments is at its weakest since 2008, according to an April International Monetary Fund report. With total public and private debt obligations estimated at 350 per cent of gross domestic product, the US Congressional Budget Office has recently described the path of US debt (and deficits) as almost doubling over the next 30 years.

But this is not just a US phenomenon. Globally, the picture is similarly precarious, with debt stubbornly high in Europe, rising in Asia and surging across broader emerging markets. A decade on from the beginning of the financial crisis, the world has the makings of a fresh debt crisis.