Critical Levels, Critical Ranges, and Imprecise Exchange Rates in Population Axiology

According to Neutral-Set Views in population axiology, some number of lifetime welfare levels are contributively neutral. Adding a life at these makes that neither better nor worse. If just one level is neutral, the view counts as Neutral-Level View. this leaves new equally good original. more than Neutral-Range within range renders incommensurable with original.
 In paper, I sharpen old objections views and offer ones. cannot avoid certain Repugnant Sadistic Conclusions. imply lives featuring no or bad components whatsoever can nevertheless swallow up neutralise goodness badness. Both classes entail small changes correspond worryingly large differences contributive value.
 then retains much appeal while avoiding above pitfalls. On Imprecise Exchange Rates View, quantity required outweigh given unit imprecise. This imprecision source incommensurability between populations.