Research Frontiers

This chapter discusses how the SWF framework can be generalized to accommodate variable-population cases and differentiated individual responsibility. The framework, as presented in earlier chapters, assumes a fixed-population setup (the very same individuals exist in all outcomes). Conversely, a variable-population setup allows for individuals who exist in some outcomes but not others. Extending the SWF framework to this case means grappling with the philosophical literature on population ethics—specifically, grappling with the ethical significance of non-identity and deciding how to make ethical comparisons between outcomes with different total population sizes. Earlier chapters also focus solely on the pattern of well-being in outcomes—ignoring that two individuals who are at the same well-being level may be differentially responsible for their condition and thus have unequal ethical claims to a well-being improvement. The economic literature on equality of opportunity (EOp) provides a structure for generalizing the SWF framework to reflect differentiated responsibility.