[niko001]

That's super interesting! I can see their study included asking to what extent the participants are experiencing certain negative/positive feelings (which may give some more context), but isn't their core measure of happiness also capped? They use a continuous response scale, but in terms of being capped, it shouldn't matter if it's measured on a 0-100 or 1-5 scale, no? The participants can't be happier than "extremely happy" in their study design as far as I can tell.