Jean Baccelli's Lunchtime Talk Interpersonal Comparisons of What

Item: Jean Baccelli's Lunchtime Talk Interpersonal Comparisons of What
Rating: 4
Author: PostSingularity Institute

by Jean Baccelli

Humanities, Social Sciences & Thought Philosophy & Ethics QDTTopics in philosophy QDTSSocial and political philosophy

🎙 Jean Baccelli 👥 4K 📅 March 9, 2026 ⏱ 58 min 👁 27 📄 expert opinion 🧭 2026-08-16

Available in: English (current) Français

Keywords

interpersonal comparisonswelfaresocial choiceArrow's theoremBorda countNash bargaining

Summary

Jean Baccelli’s talk addresses the role of interpersonal comparisons of welfare in social choice theory. He begins by distinguishing between comparisons of welfare levels and welfare differences, and introduces the ’necessity claim’—the idea that any satisfactory social choice requires such comparisons. He notes that this claim was historically derived from Arrow’s impossibility theorem, but modern social choice theory, using the social welfare functional framework, shows it to be false. Counterexamples like Borda count and Nash bargaining solution satisfy desirable conditions without explicit interpersonal comparisons. However, Baccelli argues that these examples implicitly rely on interpersonal comparisons of welfare, though not necessarily of utility. He highlights two main conclusions: welfare comparisons go beyond utility comparisons, and measurability and comparability assumptions are not independent. The talk is a work in progress, focusing on Borda and Nash to illustrate these points.

137 words

Critical Evaluation

Value of the Information & Strength of the Argument

The talk provides a nuanced analysis of a central topic in social choice theory. It clearly explains the necessity claim and its historical context, then presents modern counterexamples. The argument is well-structured, moving from preliminaries to specific cases. Baccelli’s claim that Borda and Nash implicitly involve interpersonal comparisons is thought-provoking and adds value to the debate. However, the argument is not fully developed, as it is a work in progress, and some points are left open.

Scientific Rigor, Source Quality, Title Accuracy

The talk demonstrates scientific rigor by grounding the discussion in established frameworks (Arrow’s theorem, social welfare functionals) and referencing key literature (Sen’s 1970 book). The sources are not explicitly cited in the video, but the context suggests familiarity with the field. The title is somewhat vague but accurately reflects the content. The talk is an expert opinion, not a peer-reviewed study, so its claims should be considered provisional.

159 words

Title / Content Match

The title is somewhat vague but accurately reflects the focus on interpersonal comparisons, with the 'of what' hinting at the distinction between utility and welfare.

Quality & Reliability

8/10

The talk is given by a researcher with a PhD in philosophy and economics, and it engages with formal social choice theory. The argument is structured and references established frameworks (Arrow's theorem, social welfare functionals). However, it is a work in progress and not peer-reviewed.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

Sen, A. (1970). Collective Choice and Social Welfare — Referenced as the source of the generic non-comparability axiom.

Contribution & Novelties

The talk contributes to the debate on interpersonal comparisons by arguing that counterexamples to the necessity claim (Borda, Nash) still rely on implicit interpersonal comparisons of welfare. It also highlights a conceptual limitation in the social welfare functional framework regarding comparability. The distinction between utility and welfare is emphasized.

Pour aller plus loin :

Arrow’s impossibility theorem — Background on the theorem that founded social choice theory.
Social welfare function — Overview of the framework used in the talk.
Borda count — Voting method discussed as a counterexample.
Nash bargaining game — Bargaining solution discussed as a counterexample.

98 words

Radar Profile

The radar profile shows high scores in quality of information, technical level, and reliability, with a slightly lower score in quantity of information. This indicates a technically rigorous but focused presentation, suitable for an expert audience.

Reliability 8/10