@dgar can somebody calculate the probable quantity of banknotes in that pile? It might make the concept of a billionaire more comprehensible.
@peterbrown @dgar Quick & Dirty calculation: assume the pile is a cone; its volume is 1/3 pi r^2 h. From the relative size of the people let's say it is 5m high, radius 2m. That gives a volume roughly 21 cubic.m. A £50 note is 146mm x 77mm, so lets say about 100 per sq.m & 100,000 per cubic metre.
That gives the heap there in the order of 2,100,000 £50 notes or £105 million. You'd need 10 such piles to be a billionaire (using the now habitual US short billion)