In recent years,open marriage has been sprouting up in the marriage market.It has freed sex from traditional marriage.People can therefore reappraise the costs and benefits of marriage.In order to maximize efficiency,they try to make the rational decision to marital investment.From the perspective of economics,the cost -benefit ratio of open marriage is higher than traditional marriage.This is why some people choose open marriage.However,open marriage may breach public order and social customs so that it cannot be confirmed and ensured by law.Thus,developing the alternative mechanisms of marriage is the best way to seek a solution for open marriage.%近些年,在婚姻市场中逐渐出现了开放式的婚姻形式,人们将性从爱情和婚姻的捆绑中解放出来,重新评估婚姻的成本和收益,理性地对婚姻投入进行决策,以此寻求婚姻生活的效益最大化.从经济学角度来看,开放式婚姻的成本收益率确实高于传统婚姻,这是一部分现代人选择开放式婚姻的根本原因.然而,在现行婚姻法律体制下开放式婚姻可能存在违反公序良俗的问题,无法得到法律的认可,婚姻双方的权益也难以得到法律的保障.因此,探索和建立婚姻的替代机制是帮助开放式婚姻走出法律困境的最佳选择.
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