police

"police" は誰でも知っている単語ですがNUDGE by R. H.Thaler and C. R. SusteinのPrivatising Marriageの章に出てきた "police" は動詞なので、警察署/警官の意味ではありません。
As a matter of history, a primary reason for the official institution of marriage has been not to limit entry but to police exit--to make it difficult for people to abondon their commitments to one another. Of course, there are good reason for this form of policing, which can operate as a nudge or as much more.
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But in the mordern era, exit is much less rigorously policed.
上の文での "entry" は結婚で、 "exit" は離婚を意味しています。さて、"police" を辞書で確認します。
・Collins English Dictionary: 5.to regulate, control, or keep in order by means of a police or similar force　6.to observe or record the activity or enforcement of ⇒ a committee was set up to police the new agreement on picketing
・Cambridge English Dictionary: to control the way in which a possibly dangerous substance is dealt with or a dangerous activity is done: The use of these chemicals must be carefully policed.
・Merriam-Webster's Online Dictionary: to supervise the operation, execution, or administration of to prevent or detect and prosecute violations of rules and regulations: The international agency polices the development of atomic energy facilities.