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The letter to the Financial Times went like this:

Dear Economist,

I’m looking for ”the one”. Is he out there?

Yours,

Ruth, Barcelona

And the answer, from Tim Hartford, the “Undercover Economist”:

Dear Ruth,

It might help if we understand which elements of marriage are common to many potential husbands, and which are unique to ”the one”.

First, marriage offers economies of scale in production, particularly production of children. Husband and wife can each specialise in different skills, according to their comparative advantage. I fail to see why you cannot realise these economies of scale with almost anyone. Second, there are economies of scale in consumption. One garden will do, so will one kitchen.

The real question, then, is whether you can stand the person you marry enough to enjoy these efficiencies. Here, economics had little to say until a recent breakthrough by the economists Michele Belot and Marco Francesconi. They examined data from a speed-dating company, and discovered, unsurprisingly, that women like tall, rich, well-educated men. Men like slim, educated women who do not smoke.

The more intriguing finding emerged when pickings were scarce. Women ”ticked” about 10 per cent of men as worthy of further investigation, regardless of the quality of a particular crop. If the men were short and poor, then the women lowered their standards, and still picked 10 per cent. The men, too, abandoned unrealistic ambitions. They ”ticked” about a quarter of the women, regardless of quality. This happened even though each could have a complimentary speed date another time if he or she found no one they liked.

My conclusion: even when there is little to be lost from maintaining standards, people are very quick to lower them. My advice: do likewise.