Not sure if you&#x27;re trying to disagree with me.<p>(1) When people claim they care about X on surveys, but then don&#x27;t back it up when they actually have to spend their own money, I trust the second measure as their &quot;real&quot; preference more than their first.  (Lots of ways to justify this, but the single biggest one is just that survey answers are wildly inconsistent with each other.)<p>(2) Insofar as preference depend on nudges&#x2F;framing -- that is, insofar as preferences aren&#x27;t even uniquely defined -- then you need to actually test the various nudge.  Seat size penalties have never been tried, so your claim that &quot;evidence says people won&#x27;t look at anything but price&quot; isn&#x27;t valid.  Maybe you didn&#x27;t understand what I meant by this?  The whole point is to <i>adjust the price on the search page</i> to incorporate those other factors.  If, in this situation, people <i>continue</i> to seek out tiny seats, then by golly, I think we should conclude that those seats represent their true preferences.<p>I think everything else you&#x27;ve written is also consistent with my primary claim, which is that we should not legislate seat sizes.  I appreciate the other info, though.