The DOI matches its Crossref record; 22 of the 22 references it cites were found in a registry or an index.
Managerial Incentive Problems: A Dynamic Perspective
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The paper studies how a person's concern for a future career may influence his or her incentives to put in effort or make decisions on the job. In the model, the person's productive abilities are revealed over time through observations of performance. There are no explicit output-contingent contracts, but since the wage in each period is based on expected output and expected output depends on assessed ability, an "implicit contract" links today's performance to future wages. An incentive problem arises from the person's ability and desire to influence the learning process, and therefore the wage process, by taking unobserved actions that affect today's performance. The fundamental incongruity in preferences is between the individual's concern for human capital returns and the firm's concern for financial returns. The two need be only weakly related. It is shown that career motives can be beneficial as well as detrimental, depending on how well the two kinds of capital returns are aligned.
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Citations
Cites
The Market for "Lemons": Quality Uncertainty and the Market Mechanism
Akerlof, G. A. (1970) · The Quarterly Journal of Economics · doi:10.2307/1879431 · Cited by 23,016
Agency Problems and the Theory of the Firm
Fama, E. F. (1980) · Journal of Political Economy · doi:10.1086/260866 · Cited by 10,543
Moral Hazard and Observability
Holmstrom, B. R. (1979) · The Bell Journal of Economics · doi:10.2307/3003320 · Cited by 8,159
Self-citationThe Economic Theory of Agency: The Principal's Problem.
Ross, S. A. (1973) · American Economic Review · Cited by 4,113
Scharfstein, D. S., & Stein, J. C. (1988) · American Economic Review · Cited by 2,790
Efficient Capital Markets, Inefficient Firms: A Model of Myopic Corporate Behavior
Stein, J. C. (1989) · The Quarterly Journal of Economics · doi:10.2307/2937861 · Cited by 2,585
An Analysis of the Principal-Agent Problem
Grossman, S. J., & Hart, O. (1992) · Hübner international series on risk, insurance, and economic security · doi:10.1007/978-94-015-7957-5_16 · Cited by 1,933
Optimal Incentive Contracts in the Presence of Career Concerns: Theory and Evidence
Gibbons, R. S., & Murphy, K. J. (1991) · Journal of Political Economy · doi:10.1086/261826 · Cited by 1,825
Risk Sharing and Incentives in the Principal and Agent Relationship
Shavell, S. (1979) · The Bell Journal of Economics · doi:10.2307/3003319 · Cited by 1,314
Authority, Control, and the Distribution of Earnings
Rosen, S. (1982) · The Bell Journal of Economics · doi:10.2307/3003456 · Cited by 1,192
Research works printed but not linked: 3
- Ross, Stephen (1977): \The Determination of Financial Structure: The Incentive Signaling Approach," The Bell Journal of Economics, V ol. 8, No. 1, pp. 23-40.
- Fudenberg, Drew; Tirole, Jean (1986): \A `Signal-Jamming' Theory of Predation," Rand Journal of Economics, V ol. 17, No. 3, pp. 366-76.
- Milgrom, Paul; Roberts, John (1988): \An Economic Approach to In uence Activities," American Journal of Sociology, V ol. 94, Supplement, pp. 154-79.
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Metadata
- Authors
- Holmstrom, B.
- Affiliations
- National Bureau of Economic Research (US)
- Corresponding author
- Holmstrom, Bengt
- Venue
- Review of Economic Studies
- Publisher
- Oxford University Press (OUP)
- Published
- 1999-01
- Volume
- 66
- Issue
- 1
- Pages
- 169-182
- ISSN
- 0034-6527 (ISSN-L)
- 1467-937X
- OpenAlex
- W2108548811
- Cited by
- 3,172
- References
- 22
- Citations by year
- 2026: 123 · 2025: 161 · 2024: 127 · 2023: 152 · 2022: 103 · 2021: 128 · 2020: 133 · 2019: 121 · 2018: 130 · 2017: 149 · 2016: 136 · 2015: 135 · 2014: 148 · 2013: 144 · 2012: 140
- FWCI
- 146.58
- Type
- journal article
- Language
- en
- Open access
- green
- doi.org
- Locations
- The Review of Economic Studies (publishedVersion)
- National Bureau of Economic Research (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- SSRN Electronic Journal (submittedVersion)
- Topics
- Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Labor market dynamics and wage inequality
- Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Experimental Behavioral Economics Studies
- Social Sciences › Business, Management and Accounting › Accounting › Accounting and Organizational Management
- Keywords
- managerial incentives, career concerns, human capital, effort incentives, performance-based pay, implicit contracts, ability assessment, wage contracts
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