Indigenous people don't have mortgages. They may not have churches, governments or police forces. They don't find themselves awake at 4am worrying about whether

Indigenous people don't have mortgages. They may not have churches, governments or police forces. They don't find themselves awake at 4am worrying about whether they can make next month's rent because a freelance client just dropped them. But this doesn't mean they don't have the same cognitive mechanisms that you and I have. Animal psychology is a proxy for human psychology just as animal biology is a proxy for human biology, which is why we first test human medicine in mice. There are obvious cognitive similarities between domesticated dogs and wolves in the wild even though there are obvious differences. We can study one to learn about the other. Agreed that being a CEO is probably a high stress job. But I think you nailed it when you said that being poor is really stressful. Saying that lower status individuals experience more stress doesn't mean that some very high status people don't experience more stress. If you're a world-famous rock star or athlete, I'm sure you experience a tremendous amount of stress. But on average, the lower your status, the more powerless you feel, the more stress you experience. You have less control over your life. But I might be wrong. Maybe it's different in humans. If you're not convinced by ethological studies, one could study cortisol levels in human beings and gauge relative status to see if stress correlates. My point being: there are ways to prove evolutionary psychology hypothesis.