Inequity Aversion and Last-Place Aversion

**Inequity aversion** is the well-documented preference for fair outcomes over merely favourable ones — people dislike unequal allocations, and will sacrifice material gain to avoid them. It comes in two forms with quite different implications. **Disadvantageous inequity aversion** is the dislike of receiving less than others; it is strong and widely observed. **Advantageous inequity aversion** is discomfort at receiving more; it is weaker and more variable. The asymmetry means most of the behavioural force comes from resenting being behind rather than from unease at being ahead. ## Last-place aversion A specific and sharper version: people are especially averse to being at the *bottom* of a distribution, and will take risks or accept losses to avoid it. Experimental work finds that individuals near the bottom of a ranking will oppose changes that would benefit them if those changes also lift someone below them past their own position. This produces the uncomfortable result that people sometimes resist policies that would help them, because of who else is helped. It is not irrational once relative position is part of the utility being maximised — it just means the thing being maximised is not absolute welfare. ## The "everyone must suffer" diagnosis A common explanation for hostility toward people who dodge a shared discomfort — the person who holds a place with an object instead of standing in the rain, the colleague who negotiates an exemption — is resentment that they escaped something you endured. Inequity aversion and last-place aversion give this diagnosis real support. The resentment is a documented pattern, not a cynical invention, and it is strongest exactly where the escape is visible and the cost you paid is recent. But it is **incomplete as an explanation** of any particular case, for a specific reason: it is indistinguishable from the outside from a legitimate free-rider objection. Someone taking a benefit without paying its cost is genuinely a fairness problem, independent of anyone's feelings about it — and where the resource is scarce, the objection is *material* rather than merely normative. So the honest position is that both are usually present in different proportions, and the proportion depends on the context. Where a place-holder's behaviour harms nobody, the spite reading is doing most of the work. Where it consumes a scarce resource, there is a real grievance underneath. See Claim-as-Use Versus Claim-as-Marker: Why Sunbed Hoarding and Queue Markers Differ.