Rockefeller know how to be happy? The Standard Oil empire made ... but not focus on money itself to make you happier. The notion that a certain threshold of money will provide ultimate happiness ...

The first one is, "Money will make you happy;" the other is ... traits are helpful both in making a lot of money and in making them happy. Billionaires are experts in human psychology, which ...

Follow @Reialirui on X, formerly Twitter. This article originally appeared on Arizona Republic: How much money do you need to ...