Fascinating quote from Keynes in a McK article which sadly descends into a sales pitch for scenario planning (not that I´m against it, just the sales pitch).

The inhabitant of London [in August 1914] could order by telephone,
sipping his morning tea in bed, the various products of the whole
earth, in such quantity as he might see fit, and reasonably expect
their early delivery upon his doorstep; he could at the same moment and
by the same means adventure his wealth in the natural resources and new
enterprises of any quarter of the world, and share, without exertion or
even trouble, in their prospective fruits and advantages; or he could
decide to couple the security of his fortunes with the good faith of
the townspeople of any substantial municipality in any continent that
fancy or information might recommend