Generally, readibility is better when you have a larger vertical aspect the aspect ratio. Especially in the age where many sites are designed with verticality in mind due to the prevalence of mobile.
16:9 is good for media consumption and games, but its not ideal for general web browsing and reading.
Depends on how low you define it. Many have monetary like transactions for procreation (e.g male insects offering food, some wasps offering service to mix her eggs into the colony eggs, penguins offering stones to mate), so the idea of offering a good/currency for a service is not innately human.