I'm far from up on the research, and I've heard conflicting versions of what research supports. But, this article seems to be treating the relationship as clear

I'm far from up on the research, and I've heard conflicting versions of what research supports. But, this article seems to be treating the relationship as clearly causal but modest. From the first paragraph: "Scientists have studied the relationship between money and happiness for decades and their conclusion is clear: Money buys happiness, but it buys less than most people think (Aknin, Norton, & Dunn, 2009; Diener & Biswas-Diener, 2002; Frey & Stutzer, 2000). The correlation between income and happiness is positive but modest.."