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Bibliometric and systematic analysis of the literature on the Hartwick rule in non-renewable resources

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  • Cotrina-Teatino, Marco A.
  • Marquina-Araujo, Jairo J.
  • Mamani-Quispe, Jose N.
  • Arango-Retamozo, Solio M.
  • Gonzalez-Vasquez, Joe A.

Abstract

The Hartwick rule states that an economy can be sustainable if the revenues from the exploitation of non-renewable resources are reinvested in other forms of capital that benefit future generations. This study aims to conduct a bibliometric and systematic review of all research published up to 2024 on the application of the Hartwick rule in the context of non-renewable resources. A mixed-method approach was employed, combining bibliometric analysis, text mining, and qualitative content analysis. The review is based on 71 peer-reviewed articles selected using the PRISMA protocol, complemented by an ad hoc search in leading academic databases. The findings show how the Hartwick rule has evolved from a theoretical concept to a practical tool for guiding public policy, particularly in countries heavily dependent on oil, minerals, or gas. The literature is structured around three main thematic areas: the theoretical and economic foundations of the rule; its application in the management of non-renewable resources; and the assumptions and conditions required for its sustainability. This study provides a structured overview of the Hartwick rule's evolution and application in non-renewable resource management, underscoring its relevance for sustainability.

Suggested Citation

  • Cotrina-Teatino, Marco A. & Marquina-Araujo, Jairo J. & Mamani-Quispe, Jose N. & Arango-Retamozo, Solio M. & Gonzalez-Vasquez, Joe A., 2025. "Bibliometric and systematic analysis of the literature on the Hartwick rule in non-renewable resources," Resources Policy, Elsevier, vol. 107(C).
    • Handle: RePEc:eee:jrpoli:v:107:y:2025:i:c:s0301420725001965
    DOI: 10.1016/j.resourpol.2025.105654
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    1. Avinash Dixit & Peter Hammond & Michael Hoel, 1980. "On Hartwick's Rule for Regular Maximin Paths of Capital Accumulation and Resource Depletion," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 47(3), pages 551-556.
    2. Lange, Glenn-Marie & Wright, Matthew, 2004. "Sustainable development in mineral economies: the example of Botswana," Environment and Development Economics, Cambridge University Press, vol. 9(4), pages 485-505, August.
    3. d'Autume, Antoine & Schubert, Katheline, 2008. "Hartwick's rule and maximin paths when the exhaustible resource has an amenity value," Journal of Environmental Economics and Management, Elsevier, vol. 56(3), pages 260-274, November.
    4. Aaryan Gupta & Vinya Dengre & Hamza Abubakar Kheruwala & Manan Shah, 2020. "Comprehensive review of text-mining applications in finance," Financial Innovation, Springer;Southwestern University of Finance and Economics, vol. 6(1), pages 1-25, December.
    5. Geir B. Asheim & Tapan Mitra, 2021. "Characterizing sustainability in discrete time," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 71(2), pages 461-481, March.
    6. Michel Moreaux & Jean-Pierre Amigues, 2008. "Efficient and Optimal Capital Accumulation under a Non Renewable Resource Constraint," Revue d'économie politique, Dalloz, vol. 118(6), pages 791-825.
    7. Aria, Massimo & Cuccurullo, Corrado, 2017. "bibliometrix: An R-tool for comprehensive science mapping analysis," Journal of Informetrics, Elsevier, vol. 11(4), pages 959-975.
    8. Hamilton, Kirk & Clemens, Michael, 1999. "Genuine Savings Rates in Developing Countries," The World Bank Economic Review, World Bank, vol. 13(2), pages 333-356, May.
    9. Hartwick, John M, 1995. "Constant Consumption Paths in Open Eocnomies with Exhaustible Resources," Review of International Economics, Wiley Blackwell, vol. 3(3), pages 275-283, October.
    10. Cairns, Robert D. & Long, Ngo Van, 2006. "Maximin: a direct approach to sustainability," Environment and Development Economics, Cambridge University Press, vol. 11(3), pages 275-300, June.
    11. Antony, Jürgen & Klarl, Torben, 2019. "Non-renewable resources, subsistence consumption, and Hartwick's investment rule," Resource and Energy Economics, Elsevier, vol. 55(C), pages 124-142.
    12. Cass, David & Mitra, Tapan, 1991. "Indefinitely Sustained Consumption Despite Exhaustible Natural Resources," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 1(2), pages 119-146, April.
    13. Aleksandra Kuzior & Mariya Sira, 2022. "A Bibliometric Analysis of Blockchain Technology Research Using VOSviewer," Sustainability, MDPI, vol. 14(13), pages 1-15, July.
    14. Martinet, Vincent, 2007. "A step beside the maximin path: Can we sustain the economy by following Hartwick's investment rule?," Ecological Economics, Elsevier, vol. 64(1), pages 103-108, October.
    15. Mitra, Tapan & Asheim, Geir B. & Buchholz, Wolfgang & Withagen, Cees, 2013. "Characterizing the sustainability problem in an exhaustible resource model," Journal of Economic Theory, Elsevier, vol. 148(5), pages 2164-2182.
    16. Dekker, Henk-Jan & Missemer, Antoine, 2024. "Resource booms and the energy transition: What can we learn from Dutch economists' response to the discovery of natural gas reserves (1959–1977)?," Energy Economics, Elsevier, vol. 134(C).
    17. Kirk Hamilton, 1995. "Sustainable development, the Hartwick rule and optimal growth," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 5(4), pages 393-411, June.
    18. Kirk Hamilton & John Hartwick, 2005. "Investing exhaustible resource rents and the path of consumption," Canadian Journal of Economics, Canadian Economics Association, vol. 38(2), pages 615-621, May.
    19. Snyder, Hannah, 2019. "Literature review as a research methodology: An overview and guidelines," Journal of Business Research, Elsevier, vol. 104(C), pages 333-339.
    20. Cotrina-Teatino, Marco A. & Marquina-Araujo, Jairo J., 2025. "Circular economy in the mining industry: A bibliometric and systematic literature review," Resources Policy, Elsevier, vol. 102(C).
    21. Kirk Hamilton & Giovanni Ruta, 2017. "Accounting Price of an Exhaustible Resource: Response and Extensions," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 68(3), pages 527-536, November.
    22. Martinet, V. & Doyen, L., 2007. "Sustainability of an economy with an exhaustible resource: A viable control approach," Resource and Energy Economics, Elsevier, vol. 29(1), pages 17-39, January.
    23. Pfingsten, Andreas, 1986. "A note on Hotelling's rule," Resources Policy, Elsevier, vol. 12(1), pages 73-74, March.
    24. Vincent, Jeffery & Panayotou, Theodore & Hartwick, John, 1997. "Resource Depletion And Sustainability In Small Open Economies," Harvard Institute for International Development (HIID) Papers 294389, Harvard University, Kennedy School of Government.
    25. repec:bla:ecorec:v:70:y:1994:i:210:p:267-77 is not listed on IDEAS
    26. Sato, Ryuzo & Kim, Youngduk, 2002. "Hartwick's rule and economic conservation laws," Journal of Economic Dynamics and Control, Elsevier, vol. 26(3), pages 437-449, March.
    27. Withagen, Cees & B. Asheim, Geir, 1998. "Characterizing sustainability: The converse of Hartwick's rule," Journal of Economic Dynamics and Control, Elsevier, vol. 23(1), pages 159-165, September.
    28. Antoine d’Autume & Katheline Schubert, 2008. "Zero discounting and optimal paths of depletion of an exhaustible resource with an amenity value," Revue d'économie politique, Dalloz, vol. 118(6), pages 827-845.
    29. John Hartwick, 1977. "Intergenerational Equity and the Investment of Rents from Exhaustible Resources in a Two Sector Model," Working Paper 281, Economics Department, Queen's University.
    30. Cairns, Robert D., 2000. "Sustainability accounting and green accounting," Environment and Development Economics, Cambridge University Press, vol. 5(1), pages 49-54, February.
    31. Hartwick, John M. & Long, Ngo Van, 2018. "Sustainability with endogenous discounting when utility depends on consumption and amenities," Mathematical Social Sciences, Elsevier, vol. 95(C), pages 31-36.
    32. Vincent, Jeffrey R. & Panayotou, Theodore & Hartwick, John M., 1997. "Resource Depletion and Sustainability in Small Open Economies," Journal of Environmental Economics and Management, Elsevier, vol. 33(3), pages 274-286, July.
    33. John Hartwick & Ngo Van Long & Huilan Tian, 2003. "On the Peaking of Consumption with Exhaustible Resources and Zero Net Investment," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 24(3), pages 235-244, March.
    34. Nees Jan Eck & Ludo Waltman, 2010. "Software survey: VOSviewer, a computer program for bibliometric mapping," Scientometrics, Springer;Akadémiai Kiadó, vol. 84(2), pages 523-538, August.
    35. Butterfield, David W., 2003. "Resource depletion under uncertainty: implications for mine depreciation, Hartwick's Rule and national accounting," Resource and Energy Economics, Elsevier, vol. 25(3), pages 219-238, August.
    36. Taoyuan Wei, 2012. "Capital Gains and Income Arising from Nonrenewable Resources," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 52(2), pages 293-300, June.
    37. Roberto Ferreira da Cunha & Antoine Missemer, 2020. "The Hotelling rule in non‐renewable resource economics: A reassessment," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 53(2), pages 800-820, May.
    38. Becker, Robert A., 1982. "Intergenerational equity: The capital-environment trade-off," Journal of Environmental Economics and Management, Elsevier, vol. 9(2), pages 165-185, June.
    39. Roberto Ferreira da Cunha & Antoine Missemer, 2020. "The Hotelling rule in non‐renewable resource economics: A reassessment," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 53(2), pages 800-820, May.
    40. Kenneth Stollery, 1998. "Constant Utility Paths and Irreversible Global Warming," Canadian Journal of Economics, Canadian Economics Association, vol. 31(3), pages 730-742, August.
    41. Hartwick, John M, 1977. "Intergenerational Equity and the Investing of Rents from Exhaustible Resources," American Economic Review, American Economic Association, vol. 67(5), pages 972-974, December.
    42. Geir Asheim & Wolfgang Buchholz & Cees Withagen, 2003. "The Hartwick Rule: Myths and Facts," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 25(2), pages 129-150, June.
    43. Antoine d’Autume & Katheline Schubert, 2008. "Zero discounting and optimal paths of depletion of an exhaustible resource with an amenity value," Revue d'économie politique, Dalloz, vol. 118(6), pages 827-845.
    44. Yu, Yun & Lei, Yalin, 2017. "China's provincial exhaustible resources rent and produced capital stock—Based on Hartwick's rule," Resources Policy, Elsevier, vol. 52(C), pages 114-121.
    45. Figueroa B., Eugenio & Orihuela R., Carlos & Calfucura T., Enrique, 2010. "Green accounting and sustainability of the Peruvian metal mining sector," Resources Policy, Elsevier, vol. 35(3), pages 156-167, September.
    46. Wolfgang Buchholz & Swapan Dasgupta & Tapan Mitra, 2005. "Intertemporal Equity and Hartwick's Rule in an Exhaustible Resource Model," Scandinavian Journal of Economics, Wiley Blackwell, vol. 107(3), pages 547-561, September.
    47. Frederick van der Ploeg, 2010. "Voracious Transformation Of A Common Natural Resource Into Productive Capital," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 51(2), pages 365-381, May.
    48. Cotrina-Teatino, Marco A. & Marquina-Araujo, Jairo J., 2024. "Hotelling rule in non-renewable resources: A bibliometric and systematic literature review analysis," Resources Policy, Elsevier, vol. 98(C).
    49. Kirk Hamilton & Giovanni Ruta & Liaila Tajibaeva, 2006. "Capital Accumulation and Resource Depletion: A Hartwick Rule Counterfactual," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 34(4), pages 517-533, August.
    50. Mitra, Tapan, 2002. "Intertemporal Equity and Efficient Allocation of Resources," Journal of Economic Theory, Elsevier, vol. 107(2), pages 356-376, December.
    51. Hamilton, Kirk, 1994. "Green adjustments to GDP," Resources Policy, Elsevier, vol. 20(3), pages 155-168, September.
    52. Amos James Ibrahim-Shwilima & Hideki Konishi, 2014. "The Impact of Tax Concessions on Extraction of Non-renewable Resources:An Application to Gold Mining in Tanzania," Working Papers 1403, Waseda University, Faculty of Political Science and Economics.
    53. Youmanli Ouoba, 2023. "Gold companies and local economic sustainability: the case of Kalsaka Mining SA in Burkina Faso," Journal of Environmental Economics and Policy, Taylor & Francis Journals, vol. 12(1), pages 79-95, January.
    54. Asheim, Geir B. & Hartwick, John M. & Yamaguchi, Rintaro, 2023. "Sustainable per capita consumption under population growth," Resource and Energy Economics, Elsevier, vol. 73(C).
    55. Hartwick, John M. & Karp, Larry & Long, Ngo Van, 2002. "Depreciation rules and value invariance with extractive firms," Journal of Economic Dynamics and Control, Elsevier, vol. 26(1), pages 99-116, January.
    56. Dasgupta, Swapan & Mitra, Tapan, 1983. "Intergenerational Equity and Efficient Allocation of Exhaustible Resources," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 24(1), pages 133-153, February.
    57. Hediger, Werner, 2003. "Sustainable farm income in the presence of soil erosion: an agricultural Hartwick rule," Ecological Economics, Elsevier, vol. 45(2), pages 221-236, June.
    58. Antoine d'Autume & Katheline Schubert, 2008. "Zero discounting and optimal paths of depletion of an exhaustible resource with an amenity value," Post-Print halshs-00424045, HAL.
    59. Budiarto Tedja & Mochammad Musadieq & Andriani Kusumawati & Edy Yulianto, 2024. "Systematic literature review using PRISMA: exploring the influence of service quality and perceived value on satisfaction and intention to continue relationship," Future Business Journal, Springer, vol. 10(1), pages 1-9, December.
    60. Asheim, Geir B. & Buchholz, Wolfgang & Hartwick, John M. & Mitra, Tapan & Withagen, Cees, 2007. "Constant savings rates and quasi-arithmetic population growth under exhaustible resource constraints," Journal of Environmental Economics and Management, Elsevier, vol. 53(2), pages 213-229, March.
    61. Tapan Mitra, 2015. "On maximin value and policy functions in an exhaustible resource model," International Journal of Economic Theory, The International Society for Economic Theory, vol. 11(1), pages 39-58, March.
    62. Frederick Ploeg, 2011. "Rapacious Resource Depletion, Excessive Investment and Insecure Property Rights: A Puzzle," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 48(1), pages 105-128, January.
    63. Cairns, Robert D., 2006. "On accounting for sustainable development and accounting for the environment," Resources Policy, Elsevier, vol. 31(4), pages 211-216, December.
    64. Lozada, Gabriel A., 1995. "Resource depletion, national income accounting, and the value of optimal dynamic programs," Resource and Energy Economics, Elsevier, vol. 17(2), pages 137-154, August.
    65. Andre, Francisco J. & Cerda, Emilio, 2005. "On natural resource substitution," Resources Policy, Elsevier, vol. 30(4), pages 233-246, December.
    66. Lee H. Endress & James A. Roumasset, 1994. "Golden Rules for Sustainable Resource Management," The Economic Record, The Economic Society of Australia, vol. 70(210), pages 267-277, September.
    67. Asheim, Geir B. & Hartwick, John M. & Mitra, Tapan, 2021. "Investment rules and time invariance under population growth," Journal of Economic Dynamics and Control, Elsevier, vol. 123(C).
    68. Rick van der Ploeg, 2014. "Guidelines for exploiting natural resource wealth," Oxford Review of Economic Policy, Oxford University Press and Oxford Review of Economic Policy Limited, vol. 30(1), pages 145-169.
    69. Kirk Hamilton & John M. Hartwick, 2005. "Investing exhaustible resource rents and the path of consumption," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 38(2), pages 615-621, May.
    70. Solow, Robert, 1993. "An almost practical step toward sustainability," Resources Policy, Elsevier, vol. 19(3), pages 162-172, September.
    71. Goldemberg, José & Schaeffer, Roberto & Szklo, Alexandre & Lucchesi, Rodrigo, 2014. "Oil and natural gas prospects in South America: Can the petroleum industry pave the way for renewables in Brazil?," Energy Policy, Elsevier, vol. 64(C), pages 58-70.
    72. Kirk Hamilton, 2016. "Measuring Sustainability in the UN System of Environmental-Economic Accounting," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 64(1), pages 25-36, May.
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