This is Hidden Brain.
I'm Shankar Vedanta.
The year was 1964.
The legendary singer Frank Sinatra met Mia Farrow,
an up-and-coming actress, on a soundstage at 20th Century Fox.
Despite their 30-year age difference, the two began dating and fell madly in love.
Frank Sinatra bought Mia Farrow a massive nine-carat pear-shaped diamond ring.
He proposed at his home in Palm Springs.
The wedding itself was a small civil ceremony, but the celebration was lavish.
The groom gifted its bride an expensive double-row diamond bracelet.
Not long after, Mia Farrow was on the set of Rosemary's Baby when she was issued divorce papers.
Frank Sinatra didn't want her to work.
He was just old-fashioned, Mia Farrow later explained.
They divorced just two years after saying, I do.
Did the couple not talk before they got married?
Did they not discuss their values?
How is it they failed to see they were not on the same page on such an important question?
In 2014, two economics professors weighed in on the issue.
They published a paper titled, A Diamond is Forever and Other Fairy Tales.
They looked at how much couples spent on their engagement rings and weddings and tracked how long their marriages lasted.