They have been bred to do so. They are so-called “indeterminate layers”, they will continue laying eggs until their clutch is complete. This in contrast to species that are “determinate layers”, which lay a fixed number of eggs. If eggs are removed from the clutches the hens want to form, the hens just continue laying. Obviously, in nature they wouldn’t be able to lay eggs for month after month, here breeding comes into play. EDIT: The reason eggs are unfertilized is because no rooster is present. The hen starts producing the egg not knowing whether it will be fertilized and needs to lay the egg once formed.
Chickens lay one or sometimes more unfertilized or fertilized eggs a day until they have collected a clutch. If you continually collect eggs daily they will continually lay eggs because their goal is to have a clutch. A clutch usually is about a dozen eggs / why a dozen eggs became a standard. It’s a quirk of nature where humans manipulate the situation. Like how milking cows are always kept pregnant to keep producing milk.
Chickens have been domesticated for longer than ducks or geese. They have been selectively bred for egg laying, so that they lay a lot more eggs than they would ever need to do in the wild. Domestic ducks and geese also lay more eggs than wild equivalents, but they haven’t had as much time for the extreme genetic change of chickens.
Latest Answers