Here’s a snapshot of grocery prices fifty years ago in 1971, from this ad for Shop ‘n Save Supermarkets in the April 25, 1971, issue of the Pittsburgh Press.  From most browsers, you can click twice on the image above for a larger image.

While these prices might look like bargains, there has been a lot of inflation in a half century. According to this inflation calculator, the 1971 dollar is equivalent to $6.54 in 2021 dollars. So the eggs at 39 cents a dozen are the equivalent of $2.55 in today’s money.