چرا افراد ثروتمند اینقدر بدبین هستند؟ آنچه اعداد می گویند

Why are rich people so pessimistic? What the numbers say

Nature, Published online: 31 August 2026; doi:10.1038/d41586-026-02687-y Optimism about the future can seem in short supply nowadays, but people’s age, where they live and their expectations have a lot to do with it.