We examine how the rise of leading companies of this age affects real interest rates. We define “superstar firms” as firms with higher productivity growth and less investment relative to their value-added, and we construct analytic and quantitative overlapping generations models in which...

We provide a method to measure welfare, in money-metric terms, taking into account expectations about the future. Our two key assumptions are that (1) the expenditure function is separable between the present and the future, and (2) there are some households that do not face idiosyncratic...