What is a primary reason for the observed decline in fertility rates in developed countries?

One primary reason for the decline in fertility rates in developed countries is the increased focus on education and career for women. As women pursue higher education and enter the workforce, many choose to delay starting a family until they feel more established in their careers. This shift often leads to having fewer children, as women may prioritize personal and professional goals over early motherhood. For example, a woman who finishes college and starts a career may decide to wait until she is in her 30s to have children, resulting in fewer overall births. Therefore, the combination of education, career aspirations, and changing social norms plays a crucial role in lowering fertility rates.