Chickens and eggs
In 2011, there were about 6 billion egg-laying chickens in the world and they laid about 1.2 trillion eggs, which is about 3.2 billion eggs a day. That's roughly one egg every other day for everyone in the world.
Let's assume that has all scaled up proportionately to the present day.
Some people don't eat eggs and I wouldn't be surprised if the ratio works out at an egg a day for everyone who's interested in consuming the things (and two a day for me of course).
So why have we got an egg shortage at the moment?
Apparently a chicken will only lay an egg on two out of every three days on average, which is just lazy. How hard can it be? I'm sure with the right encouragement — a stick, perhaps — chickens can lay an egg a day.
So there's really no excuse for an egg shortage is there?