Because we are not eating all chickens. Obviously some chickens are raised for meat and some for eggs, but we are neither consuming all live chickens at once nor all eggs at the same time.

Each hen will lay approx 1-2 eggs daily starting at 6mo of age regardless if there's a rooster or not. If you have a rooster, then most of those eggs will hatch, otherwise they go to the market.

There are at any given point, about 25 billion chickens in the world.

The state of Iowa has 60 million chickens.

Each chicken only needs to have one chick to replace itself. Over it's lifetime, a chicken can produce 1000s more chickens if you remove the eggs and put them into incubators fast enough.

Chickens, the hens, lay a lot of eggs before they get eaten. I believe chicken is like beef and the meat usually comes from the males since only one is necessary usually.

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