Academic excerpt on intergenerational consumption, fertility, and long‑term interest rates

Academic excerpt on intergenerational consumption, fertility, and long‑term interest rates The passage is a technical discussion of economic theory with no mention of individuals, institutions, financial transactions, or controversial actions. It provides no actionable investigative leads. Key insights: Derives marginal rate of substitution (MRS) linking consumption to fertility and survival.; Applies evolutionary equilibrium assumptions to derive a formula for the long‑term real interest rate.; References prior work and theoretical models, not specific actors or events.