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The correct answer is marriage gradient

Marriage gradient refers to the phenomenon where men tend to marry women who are younger, more attractive, smaller physically, and less educated or professionally successful compared to them. Conversely, women tend to marry men who are older, larger in size than them, and more educationally and professionally successful than them. 

Answer:

Marriage gradient.

Explanation:

In further broad titles, the mating gradient determines that when men rise in status, they broaden their provisions of eligibles; when females grow in status, their provisions of eligibles grows tighter, driving to an aggravation of the feminine marriage restraint.