Category: time-and-causality
Type: argument
Associated thinker(s): Peter van Inwagen, Carl Ginet
Original publication or approximate period: Modern formulations in Ginet (1966) and van Inwagen (1975, 1983)
Difficulty: Advanced
Themes: free will, determinism, control
Related experiments: Laplace’s Demon; Frankfurt Cases
Imagine that a person does not raise a hand at a meeting. Assume determinism: the remote past together with the laws entails that action. The person has no control over the remote past or the laws. The argument asks how the person could nevertheless have had a choice about their consequence, the unraised hand.
This is an argument family illustrated by a hypothetical choice, rather than a freestanding narrative thought experiment. The difficult work lies in the inference transferring lack of choice from the past and laws to what they entail. Different formal versions use different principles for that transfer.
Does inability to alter the past or laws imply inability to act otherwise if those facts determine the action?
The argument gives structure to an intuition that can otherwise remain a vague image of humans as machines. It requires an account of ability, law, and counterfactual dependence. The debate is conditional: it asks what follows if determinism is true, without establishing that physical determinism actually holds.
Incompatibilist response: doing otherwise with the same past and laws is unavailable. Since the agent cannot change those background facts, the required alternative is beyond the agent’s control.
Compatibilist counterfactual response: if the person had acted otherwise, something about the past or laws would have differed; it does not follow that the person would have caused the past or laws to change. Ordinary abilities can depend on circumstances outside the person’s control.
Logical scrutiny: some proposed transfer principles have counterexamples. Defenders revise the formal argument; critics ask whether the revisions remain independently plausible. No single intuitive slogan substitutes for examining the chosen version.
The argument is not the fallacy that a true statement about tomorrow makes tomorrow metaphysically necessary. It explicitly uses determinism and claims about control. Nor does rejecting this argument prove that every kind of freedom survives determination. A successful rebuttal must say which step fails and what conception of ability replaces it.
Counterfactual and modal formulations sharpen different aspects of the argument. Frankfurt cases question a separate link between alternatives and responsibility. Reading them together helps prevent an argument about one kind of freedom from being mistaken for a complete theory of moral accountability.
The retrieved SEP entries verify the modern attribution and discuss disputed transfer principles, including revisions. This introductory account omits the full formal proofs and is labeled an argument to avoid expanding “thought experiment” without notice.
Research check: 2026-10-30. References above were retrieved for the support described; this is an original educational explanation, not a substitute for the primary texts. Additional speculative comparisons are teaching prompts, not established historical variations.