Since it is harder to get out of a marriage than a long-term relationship, getting married increases the switching costs for being in a relationship.

Question

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Marriage involves legal obligations and formalities that make it more difficult to dissolve than a long-term relationship. This increases the potential costs (both financial and social) of ending the relationship, making it more likely that individuals will stay in an unhappy marriage rather than go through the legal and emotional process of divorce.

Since It Is Harder to Get Out of a Marriage