The world’s most powerful investors have been advised to buy farmland, stock up on gold and prepare for a “dirty war” by Marc Faber, the notoriously bearish market pundit, who predicted the 1987 stock market crash.

The bleak warning of social and financial meltdown, delivered today in Tokyo at a gathering of 700 pension and sovereign wealth fund managers.

Dr Faber, who advised his audience to pull out of American stocks one week before the 1987 crash and was among a handful who predicted the more recent financial crisis, vies with the Nouriel Roubini, the economist, as a rival claimant for the nickname Dr Doom. . . .