homunq comments on Why Our Kind Can't Cooperate - Less Wrong
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I think the positive effect is that they can say that they sell salads, people can convince themselves they intend to buy the salad, and so on.
I saw a study recently that said that the mere presence of a salad on the menu increases people's consumption. I deeply doubt that fast food chains were surprised by that result.
From the nature of the study, it's not even about convincing themselves they intend to buy a salad. By merely seriously having considered the option, they give themselves virtue points which offset the vice of more consumption.