The compromise efficiency vs. egalitarianism among generations with an infinite horizon

This paper concerns ethical aggregation of infinite utility streams. Position i is typically interpreted as the endowment of generation i. We analyze the broad question: In order for the social welfare to increase, the interest of how many generations can be respected if we intend to be "ethical"? Here "ethical" refers to verifying adequate equity axioms, and case-studies cover: extensions of restricted non-substitution; or Hammond Equity-related principles; together with the usual Anonymity axiom.