Reminds me of my (never to be forgotten) introduction to inflation. As a kid I was given 3 bob to go to the newsagents to get dad's tobacco and cig papers. That came to 2s/7d, giving me 5d for sweets. Then the price jumped up to 2s/9d ha'penny but dad still only gave me 3 shillings, leaving me only 2d ha'penny for sweets.