Final answer:
The central idea of the excerpt is that marriage serves various socio-economic and legal functions in society, with implications for gender roles and property rights, and is subject to change with evolving social norms.
Step-by-step explanation:
The central idea of the excerpt revolves around the various functions and rules that marriage serves in society, indicating that it is a complex social institution rather than just a simple union based on love and affection. Throughout different societies and times, marriage has served to produce and nurture offspring, reduce competition among individuals, create economic alliances, and solidify social status and property. Moreover, it highlights the various social constructs surrounding marriage such as gender roles, family structures, and social norms like endogamy and exogamy, while pointing out that concepts of marriage can change and adapt with the times.
In analyzing the excerpts, it is clear that marriage is not solely for love and affection, but is heavily influenced by economic, legal, and social considerations. Laws of endogamy and exogamy, the control of property through dowry, and the legal implications of marriage on women's rights are all historical examples of marriage serving multiple purposes beyond romantic love. Even in contemporary times, evolving social policies and shifting opportunities, particularly for women, indicate that marriage remains a vital, yet evolving, institution within societies.
The excerpts find a common theme in pointing out the societal and individual benefits and limitations of marriage, and how society's perception of it continually evolves with cultural norms and values. This is reflective in the changing roles of men and women within marriages and how marriages can adapt to new societal norms, like the example provided of Iceland where a significant number of children are born to committed but unmarried couples.