Agreement between moral theories › A promise as a test case

Return to a hypothetical promise. A friend has arranged transport around your offer of a lift. Keeping it is inconvenient, and you could instead spend the time on something enjoyable. We can examine the reasons under different principles without pretending that this invented case is a passage from Parfit.

An act-focused approach might begin by comparing the consequences of keeping and breaking this particular commitment. A rule-focused approach asks about principles permitting departures from assurances in circumstances of this kind. It considers how adopting those principles affects the ability to rely on commitments. The difference is one of what is being assessed, not simply whether the person doing the assessment cares about consequences.

A Kantian contractualist asks whether everyone could rationally will the relevant principle's universal acceptance. The friend whose plans depend on the assurance matters within that question, as does the person who made it. Stating their interests does not yet show what each could rationally will. We must specify the principle and the reasons available to both positions.

A Scanlonian approach asks whether a principle allowing cancellation for this kind of convenience could reasonably be rejected. The friend's reliance gives an objection to permission. The promiser's burden supplies a consideration against a stricter alternative. Comparing these considerations requires more than asking whether either person is unhappy with the result.

Agreement in this case would still leave harder cases. Suppose the promised lift conflicts with an urgent rescue. A defensible principle might distinguish inconvenience from an emergency. The work lies in defending that distinction and its limits. Adding an exception whenever our preferred verdict changes would conceal the question of principle that the example was meant to expose.