A comparative analysis of two foundational thought experiments in moral philosophy. 8 min read.
The Trolley Problem, introduced by Philippa Foot in 1967 and later developed by Judith Jarvis Thomson, presents a scenario: a runaway trolley is heading toward five people tied to the track. You can pull a lever to divert the trolley onto a side track, where it will kill one person. Is it permissible to pull the lever? Most people say yes. The Survival Lottery, by contrast, asks whether it is permissible to institute a policy of killing one healthy person to save two patients in need of organs. Most people say no. Why the difference?
| Feature | Trolley Problem | Survival Lottery |
|---|---|---|
| Scale | One-off emergency | Systematic policy |
| Ratio | Kill 1 to save 5 | Kill 1 to save 2 |
| Intention | Foreseen but unintended | Directly intended |
| Institutionalization | None | Formal, state-run |
| Victim's Identity | Unknown | Randomly selected |
| Moral Intuition | Permissible (usually) | Impermissible (usually) |
The key difference lies in the nature of the act. In the Trolley Problem, the death of the one is a foreseen but unintended side effect of diverting the trolley. In the Survival Lottery, the death of the one is the intended means to saving the two. This difference is captured by the Doctrine of Double Effect, which holds that it is sometimes permissible to cause harm as a side effect but never as a means to a good end.
Another difference is the institutional context. The Trolley Problem is a one-time emergency where the agent is forced to choose. The Survival Lottery is a premeditated policy. The lottery requires planning, legislation, and enforcement. It turns killing into a routine administrative procedure. This institutionalization is part of what makes it so horrifying.
Both thought experiments challenge us to articulate the principles that govern our intuitions. The Trolley Problem reveals that we are willing to trade lives in certain contexts. The Survival Lottery reveals that we are not willing to trade lives in other contexts. The task of moral philosophy is to explain the difference.
Referenced Works & Texts
- Philippa Foot, "The Problem of Abortion and the Doctrine of Double Effect," Oxford Review, No. 5 (1967). The original formulation of the Trolley Problem.
- Judith Jarvis Thomson, "The Trolley Problem," Yale Law Journal, Vol. 94, No. 6 (1985). A detailed analysis of the problem and its variations.
- John Harris, "The Survival Lottery," Philosophy, Vol. 50, No. 191 (1975). The thought experiment that extends the logic of the Trolley Problem to a systemic policy.
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