Yeah, I think it’s a good question how much of a role some sort of salient default is doing. In general (“status quo bias”) people do have a preference for default choices, and this is of course generally reasonable since “X is the default option” is generally evidence that most people prefer X. (If they didn’t, the people setting the defaults should change it!). So that phenomenon clearly exists, and seems like it’d help explain the effect.
I don’t know much empirical literature off-hand looking at variants like you’re thinking of, but I imagine some similar things exist. People who trade more regularly definitely exhibit the endowment effect less. Likewise, if you manipulate whether you tell the person they’re receiving a “gift” vs less-intentionally winding up with a mug, that affects how many people trade. So that fits with your picture.
In general, I don’t think the explanations here are really competing. There obviously are all sorts of factors that go into the endowment effect—it’s clearly not some fundamental feature of decision making (especially when you notice all the modulators of it that have been found), but rather something that comes out of particular contexts. Even with salience and default effects driving some of it, incomparability will exacerbate it—certainly in the valuation paradigm, for the reasons I mentioned in the post, and even if the exchange paradigm because it will widen the set of people for whom other features (like defaults, aversion to trade, etc.) kick in to prevent them from trading.
Yeah, I think it’s a good question how much of a role some sort of salient default is doing. In general (“status quo bias”) people do have a preference for default choices, and this is of course generally reasonable since “X is the default option” is generally evidence that most people prefer X. (If they didn’t, the people setting the defaults should change it!). So that phenomenon clearly exists, and seems like it’d help explain the effect.
I don’t know much empirical literature off-hand looking at variants like you’re thinking of, but I imagine some similar things exist. People who trade more regularly definitely exhibit the endowment effect less. Likewise, if you manipulate whether you tell the person they’re receiving a “gift” vs less-intentionally winding up with a mug, that affects how many people trade. So that fits with your picture.
In general, I don’t think the explanations here are really competing. There obviously are all sorts of factors that go into the endowment effect—it’s clearly not some fundamental feature of decision making (especially when you notice all the modulators of it that have been found), but rather something that comes out of particular contexts. Even with salience and default effects driving some of it, incomparability will exacerbate it—certainly in the valuation paradigm, for the reasons I mentioned in the post, and even if the exchange paradigm because it will widen the set of people for whom other features (like defaults, aversion to trade, etc.) kick in to prevent them from trading.