Common Cents
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https://academic.oup.com/jcr/advance-article-abstract/doi/10.1093/jcr/ucad020/7077142?login=false
In a six-wave longitudinal experiment, we investigated whether randomly assigning engaged or newlywed couples to merge their money in a joint bank account increases relationship quality over time. Whereas couples assigned to keep their money in separate accounts or to a no-intervention condition exhibited the normative decline in relationship quality across the first 2 years of marriage, couples assigned to merge money in a joint account sustained strong relationship quality throughout.