The global financial system seems to have a black hole at its centre. Over the last two decades, US residents have sold a total of about $5,500bn worth of IOUs to foreigners, yet the officially recorded net investment position of the US has deteriorated only by a little more than half of this amount ($2,800bn). The US capital market seems to have acted like a black hole for investors from the rest of world in which $2,700bn vanished from sight - or at least from the official statistics.

How can $2,700bn disappear?