[330] Strictly speaking, of course, the Law of modern states does not enforce this, but only refuses to recognise connubial contracts of any other kind: but the social effect is substantially the same.
[331] Sometimes such unbargained requital is even legally obligatory: as when children are bound to repay the care spent on them by supporting their parents in decrepitude.
[332] Further discussion of the method of dealing with these difficulties, in their utilitarian form, will be found in the two following chapters.
[333] Utilitarianism, chap. v.
[334] Cf. Book iii. chap. vi. §§ [2], [3].
[335] Cf. Book iii. chap. [v.]
[336] Book iii. chap. xiii. § [3].