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Some Uses of Happiness Data in Economics
Open accessAbstract
Happiness research is based on the idea that it is fruitful to study empirical measures of individual welfare. The most common is the answer to a simple well-being question such as “Are you Happy?” Hundreds of thousands of individuals have been asked this question, in many countries and over many years. Researchers have begun to use these data to tackle a variety of important questions in economics. Some require strong assumptions concerning interpersonal comparisons of utility, but others make only mild assumptions in this regard. They range from microeconomic questions, such as the way income and utility are connected, to macroeconomic questions such as the tradeoff between inflation and unemployment, including large areas in political economy. Public policy is another area where progress using happiness data is taking place. Given the central role of utility notions in economic theory, we argue that the use of happiness data in empirical research should be given serious consideration.
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“Life satisfaction is a self-reported welfare measure frequently used in economic and policy analysis (Di Tella and MacCulloch, 2006;Graham and MacLennan, 2020;MacKerron, 2012;Nikolova and Graham, 2022;Otrachshenko et al., 2022).”
From Double-edged sword: persistent effects of Communist regime affiliations on well-being and preferences (2023) · cites this paper as Di Tella and MacCulloch, 2006
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1 retracted
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RetractedSubjective well-being: Three decades of progress.
Diener, E., Suh, E. M., Lucas, R. E., & Smith, H. L. (1999) · Psychological Bulletin · doi:10.1037/0033-2909.125.2.276 · Cited by 12,910
Duflo, E. (2019) · AEA Papers and Proceedings · doi:10.1257/pandp.109.612 · Cited by 11,235
Journal of Economic Literature
Durlauf, S. N. (2019) · AEA Papers and Proceedings · doi:10.1257/pandp.109.633 · Cited by 7,666
The Quarterly Journal of Economics
Kuznets, S. (2024) · Routledge eBooks · doi:10.4324/9781003549741-8 · Cited by 7,177
Golden eggs and hyperbolic discounting
Laibson, D. (1997) · The Quarterly Journal of Economics · doi:10.1162/003355397555253 · Cited by 6,122
Does Economic Growth Improve the Human Lot? Some Empirical Evidence
EASTERLIN, R. A. (1974) · Nations and Households in Economic Growth · doi:10.1016/b978-0-12-205050-3.50008-7 · Cited by 4,474
Suicide: A study in sociology.
Durkheim, É. (2004) · American Psychological Association eBooks · doi:10.1037/10406-003 · Cited by 3,944
A Theory of Rational Addiction
Becker, G. S., & Murphy, K. (1988) · Journal of Political Economy · doi:10.1086/261558 · Cited by 3,906
What Can Economists Learn from Happiness Research?
Frey, B. S., & Stutzer, A. (2002) · Journal of Economic Literature · doi:10.1257/002205102320161320 · Cited by 3,783
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Metadata
- Authors
- Tella, R. D., & MacCulloch, R.
- Affiliations
- Harvard University (US)
- Imperial College London (GB)
- ORCID
- MacCulloch, Robert
- Venue
- Journal of Economic Perspectives
- Publisher
- American Economic Association
- Published
- 2006-02-01
- Volume
- 20
- Issue
- 1
- Pages
- 25-46
- ISSN
- 0895-3309 (ISSN-L)
- OpenAlex
- W1977288176
- Cited by
- 889
- References
- 101
- Citations by year
- 2026: 17 · 2025: 12 · 2024: 24 · 2023: 24 · 2022: 20 · 2021: 24 · 2020: 47 · 2019: 40 · 2018: 26 · 2017: 39 · 2016: 49 · 2015: 64 · 2014: 70 · 2013: 70 · 2012: 58
- FWCI
- 79.51
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Journal of Economic Perspectives (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- ResearchSpace (University of Auckland) (submittedVersion, cc-by)
- Topics
- Social Sciences › Psychology › Social Psychology › Psychological Well-being and Life Satisfaction
- Social Sciences › Sociology and Political Science › Quality of Life Measurement
- Social Sciences › Sociology and Political Science › Income, Poverty, and Inequality
- Keywords
- subjective well-being, interpersonal utility comparison, Phillips curve, political economy, public policy evaluation, happiness surveys
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