At the risk of continuing to be boring, I think it's important not to mix technical concepts with social welfare concepts; they serve different goals and it is

At the risk of continuing to be boring, I think it's important not to mix technical concepts with social welfare concepts; they serve different goals and it is easy to get a misleading impression of one when trying to apply it in the other domain. Economics is plagued with these problems (cue half-informed people raging about how "Economics assumes people are perfectly rational, but Ariely told me they weren't [0]! Take that establishment!") Utility is a very specific tool devised to model choice behavior. It is a basic idea of utility theory that "Vikram gets much less utility from the lobster than Yolanda" is not a meaningful statement within the framework. There's no wrangling or wiggle-room with this point; interpersonal utility is formally incomparable. Similarly, it is well-trodden that markets tend to allocate scarce goods to those with the greatest willingness and ability to exchange other scarce goods for them; market theory doesn't presume to say anything about who enjoys the scarce goods the most. This is why, beyond choice and market theory, we need something that addresses social value systems. Utility does not pretend to do this, except to the extent that an individual may value social justice in their personal utility function. So, while I take your point that my post was technical and, yes, dry, them's the ropes when it comes to utility theory. Correct statements tend to be boring ones that don't evoke human interest. If one wants to evoke human interest (a perfectly reasonable goal) I think it's best not to mix in half-appropriate technical concepts when there is substantial potential for confusion. [0] For anyone who is curious, I estimate 80% of Ariely's "irrational" examples are easily explained by understanding that making optimal choices with imperfect information has a cost in time and effort; when you price in this cost in time and effort, making suboptimal-but-easy-to-make or even random choices is actually perfectly rational within the framework.