Does a higher cognitive ability generally lead to earning more money? Above a certain level, no - according to a large 10-year study of 59,000 Swedish men.

"How can you justify this enormous wage gap? You can’t. As studies such as this make clear, it’s not meritocracy that is driving the wage gap; it’s plain old greed."
https://www.theguardian.com/commentisfree/2023/may/10/its-official-billionaires-arent-the-brainboxes-they-like-to-believe?CMP=fb_gu&utm_medium=Social&utm_source=Facebook&fbclid=IwAR0vmpZs01Kam5i_CS3uLZZsYEGteGmBMd18RKVlT-Y3KKhf0ps3kGJNI8g#Echobox=1683704697