Interval-Scale Theories and Variance Voting
This chapter discusses how to take into account moral uncertainty over interval-scale measurable but non-comparable theories. Once again, we make use of the analogy between decision-making under moral uncertainty and voting. We give examples of interval-scale theories where it’s plausible to think that these theories are incomparable with each other and discuss what to do in such cases. Arguing against the Borda Rule and Ted Lockhart’s Principle of Equity Among Moral Theories, we argue in favour of an account we call variance voting. Finally, we discuss what to do in conditions where one has positive credence in some merely ordinal theories, some interval-scale but non-comparable theories, and some theories that are both interval-scale measurable and comparable with each other. We discuss whether the normalization used by this account should be done only within the decision-situation at hand, or whether it should be done over all possible decision-situations.