Which layer contributes to the understanding of socioeconomic factors in a child's life?

The macrosystem is the correct choice because it encompasses the broader cultural and societal contexts that influence an individual’s life, including socioeconomic factors. This layer includes elements such as economic conditions, social norms, values, laws, and social policies that shape the environment in which children grow up. These factors can significantly affect access to resources, education, and overall well-being, thus impacting a child's development and experiences.

In contrast, the microsystem focuses on the immediate environments that a child interacts with directly, such as family, school, and peers. The mesosystem examines the interactions between different components of the microsystem, such as the relationship between family dynamics and school performance. The exosystem refers to contexts that indirectly affect a child, such as a parent's workplace, but do not involve the child directly. Therefore, while each of these systems plays a role in a child's life, it is the macrosystem that is most directly related to understanding the overarching socioeconomic factors that shape their experiences.