What factor supports maintaining a dual income household?

Maintaining a dual income household is often supported by nuclear family planning because this concept involves families that typically consist of two parents and their children, who together plan for their financial future. With both parents contributing to the household income, families are better equipped to meet financial obligations, save for their children's education, and maintain a desirable standard of living. This financial strategy often necessitates both partners working to leverage their combined incomes, especially in today's economy where the cost of living is higher. The dynamic of a nuclear family often encourages strong collaboration in financial decision-making, which makes dual incomes essential for achieving their financial goals and ensuring stability.

The other options do not directly advocate for the maintenance of dual incomes in the same way nuclear family planning does. Rising education costs may necessitate dual incomes, but they do not specifically endorse or create a structure for maintaining them. Opportunity cost addresses the trade-offs of decisions, which can imply the need for dual incomes but isn’t a direct support factor. Opening a joint bank account is a financial management strategy that may follow after establishing a dual income household, but it does not inherently support the concept of maintaining dual incomes.