In arranged marriages, the onus of lining up prospective matches rests on parents. You don't have to go about finding a date, building a relationship, and go through an emotional roller coaster ride to find someone compatible.
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Choosing a match is usually always a rational decision in arranged marriages!
In arranged marriages, a decision on who to shortlist is usually driven by objective reasons such as social, economic, and cultural compatibility. Hormones may have a very limited role to play in deciding who to get married to :)
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When the times are tough, your family will back you
Marriages always have ups and downs. In arranged marriages, your family is rooting for you and your marriage and will make sure you tide over the hurdles.
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Arranged marriages help preserve traditions
In arranged marriages, parents and relatives become an integral part of your life after marriage. Your children get to experience the traditions of your family and will probably continue the traditions when they grow up.