I recently helped one of my single male graduate students in his search for a spouse.
First, I suggested he conduct a randomized controlled trial of potential mates to identify the one with the best benefit/cost ratio. Unfortunately, all the women randomly selected for the study refused assignment to either the treatment or control groups, using language that does not usually enter academic discourse.
With the “gold standard” methods unavailable, I next recommended an econometric regression approach. He looked for data on a large sample of married women on various inputs (intelligence, beauty, education, family background, did they take a bath every day), as well as on output: marital happiness. Then he ran an econometric regression of output on inputs. Finally, he gathered data on available single women on all the characteristics in the econometric study. He made an out-of-sample prediction of predicted marital happiness. He visited the lucky woman who had the best predicted value in the entire singles sample, explained to her how he calculated her nuptial fitness, and suggested they get married. She called the police.Read the whole thing... and find out how the search for love analogizes to economic development and foreign aid.