Final answer:
Folbre uses love, obligation, and reciprocity to define the concept of a relationship. Altruism, various forms of love, and the ethical obligations of Filial piety are essential factors in understanding relationships.
Step-by-step explanation:
Folbre uses love, obligation, and reciprocity to define a concept of a relationship. Altruism and forming relationships are essential for social beings, and reciprocity plays a role in maintaining relationships. Various forms of love, such as consummate love, involve intimacy, passion, and commitment. The social exchange approach considers the costs and benefits of forming and maintaining relationships. Filial piety in Confucian ethics emphasizes obligations and care towards family members, highlighting the relational and communal aspects of ethics.