What is The Trolley Experiment?

The Trolley Experiment is a mental model used for better thinking and decision-making.

How do you apply The Trolley Experiment?

To apply The Trolley Experiment, identify situations where this framework is relevant, then use it as a lens to evaluate your options and decisions. The model is most useful when combined with other complementary mental models.

What category does The Trolley Experiment fall under?

The Trolley Experiment falls under the Philosophy, Law & Politics category of mental models. Other models in this category can be found on the Philosophy, Law & Politics hub page.

Why is The Trolley Experiment important?

The Trolley Experiment is important because it provides a structured way to think about problems that would otherwise be approached with intuition alone. Understanding this model helps you avoid common reasoning errors and make better decisions.

Where does The Trolley Experiment come from?

The Trolley Experiment is discussed in the tradition of Philippa Foot / Judith Jarvis Thomson.

The Trolley Experiment Mental Model…

The trolley problem is a thought experiment: a runaway trolley will kill five people unless you pull a lever, diverting it onto another track where it will kill one. Do you pull the lever? Most people say yes: one death is better than five. Then the variant: you can stop the trolley by pushing a large stranger off a bridge onto the tracks. One dies, five live. Same numbers; many people say no. The puzzle is why we treat the two cases differently — and what that reveals about moral reasoning, responsibility, and the limits of simple utilitarianism.

The experiment, from Philippa Foot and later Judith Jarvis Thomson, exposes tensions between (1) consequences (minimise harm), (2) actions vs omissions (doing vs allowing), (3) using a person as a means (the stranger is used to stop the trolley), and (4) proximity and agency (pulling a lever feels different from pushing someone). There is no consensus "answer"; the value is in the pressure it puts on our principles. If you're a pure consequentialist, the two cases should be the same. If they're not the same for you, you're drawing a line that consequentialism doesn't explain.

In strategy and business, the trolley problem appears in disguised form: trade-offs where one option harms fewer people but requires a more "direct" or morally salient action. Layoffs vs slow decline; recalling a product vs risking harm; firing one person to save the team. The model doesn't tell you what to do; it forces you to see that your intuitions may be inconsistent and that "maximise good" is not the only principle people use.

The Trolley Experiment

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