This is also true, but often people don't realize that when employers tell them they're literally not allowed to ask each other what they make, despite this NOT being the case because you're legally allowed the right to do so, it's basically exploiting the workers so they never have to pay people as much as the highest paid employee.

another fact wages gaps exist between workers because they don't know they are under payed, because no one talks about how much they make. Most people assume that they get payed the same, but they aren't.
Example: person A is payed 100 moneys while person B is payed 70 money. Both assume they payed the same wage, but because no one says anything they don't realize it.