World's Richest People Less Smart Than Low-Income People, Research

 In fact, research has claimed that the world's wealthiest people score lower on mental ability tests than the average person.

More than intelligence, incidental career success, opportunity, and family background play a major role in increasing the incomes of the wealthiest, the study said.

A joint study by Sweden's Linköping University, Italy's European University Institute, and the Netherlands' University of Amsterdam stated that intelligence helps increase income.

The study examined data from more than 59,000 individuals who completed a military test at age 18 or 19.

Research results refute the common belief that only knowledgeable and talented people can be successful in life or become very rich.
According to research, it's not that intelligence can't make you very rich, of course, it plays a role, but other factors are also important in becoming the richest.