D: I came across an article* from Rutgers Today published in 2014. Apparently, researchers concluded that the overall success rate of a marriage is higher if the wife is happy. If the husband is happy, it doesn't contribute much to the marriage, but if the wife is happy it could mean everything. When she's happy, she does more to make everyone happy. Her happiness overflows. If he's happy or unhappy, it doesn't really matter because men tend to think about themselves first anyway, so their mood doesn't have an outward pouring and affect everyone in the same way.
N: Um, I hope they didn't waste money paying those researchers.
D: What do you mean?
N: This is not news. There's a reason for the saying, "Happy wife, happy life."
D: Is this really something everyone already knows?
N: And its companion phrase, "If Mama ain't happy, ain't nobody happy."
D: That's true.
N: I know.
*I was cataloging a newly arrived book (Drop the Ball: Achieving More by Doing Less by Tiffany Dufu) at the library last night and flipped through so I could give it the appropriate call number. The article was referenced in the end notes of the book.