 The key idea is to maximise the standard of living of current generations but also commit to leaving future people better off by a certain proportion. Their argument comes in two steps. First, they think—along luck egalitarian lines—that there is a case for intergenerational equality. But then they add that current generations often desire to benefit the future and so there is a case for building in a commitment to bettering the condition of future people (Llavador, Roemer &amp; Silvestre 2015: 4 &amp; 35–36).