The economic models of marriage and romantic partnerships have changed since the 1950s. For a long time, economic models of marriage and relationships were treated as romantic partnerships like business partnerships. Betsey and Justin Wolfers, labour economists, they also see economics in their marriage. For example, they divided up the duties for her daughter such as feeding her and playing with her. Thus, relationship between love and economics is considered very significant among several economists because they both are the matter of being productive and efficient. Another example, Betsey and Justin decided to hire a cleaning lady for their free time. Their relationship got better than before, bringing more sense of love to the house. It is very productive and efficient for them to get a cleaning lady, because they now get the chance to spend time together during their free time.