Additional human beings add to our economic capacity rather than diminishing it, say Marian L. Tupy and Gale Pooley.
Giorgos Kallis argues that we shouldn't want economic growth to continue indefinitely. Nor will it do so.
Jessica Flanigan argues that human challenge trials can work well under real-world conditions.
Ben Bramble argues that challenge trials conflict with the virtuous, well-lived life.
Jessica Flanigan replies to Ben Bramble on the ethics of human challenge trials.