That is of course in the time of Mary Poppins, which is pre-first-world-war.
Back then, a loaf of bread in the US was something like nine cents.
See what happens when you raise the minimum wage.
LOL....I was going to post “What a bag of bird feed cost” :-)
Bread had to have been cheaper than 9 cents in 1913. I remember buying a loaf of wonder bread for a dime in the 1950s.