IDEAS home Printed from https://ideas.repec.org/p/eth/wpswif/10-137.html
   My bibliography  Save this paper

Growth and Welfare under Endogenous Lifetime

Author

Listed:

Abstract

We develop a perpetual youth model to investigate how longevity affects economic growth and welfare. Life expectancy is determined by individuals’ investments in healthcare. We find that improvements in the healthcare technology always increase the steady state growth rate. Although the effect is small, even for large increases in longevity, welfare gains may be substantial depending on the type of the technological improvement. We identify two externalities associated with healthcare investments and provide a condition when healthcare expenditures are inefficiently low in the market equilibrium. Finally, we discuss our results with respect to alternative spillover specifications in the production sector.

Suggested Citation

  • Maik T. Schneider & Ralph Winkler, 2010. "Growth and Welfare under Endogenous Lifetime," CER-ETH Economics working paper series 10/137, CER-ETH - Center of Economic Research (CER-ETH) at ETH Zurich.
    • Handle: RePEc:eth:wpswif:10-137
    as

    Download full text from publisher

    File URL: https://www.ethz.ch/content/dam/ethz/special-interest/mtec/cer-eth/cer-eth-dam/documents/working-papers/WP-10-137.pdf
    Download Restriction: no
    ---><---

    Other versions of this item:

    References listed on IDEAS

    as
    1. Klaus Prettner, 2013. "Population aging and endogenous economic growth," Journal of Population Economics, Springer;European Society for Population Economics, vol. 26(2), pages 811-834, April.
    2. Romer, Paul M, 1986. "Increasing Returns and Long-run Growth," Journal of Political Economy, University of Chicago Press, vol. 94(5), pages 1002-1037, October.
    3. Kalemli-Ozcan, Sebnem & Ryder, Harl E. & Weil, David N., 2000. "Mortality decline, human capital investment, and economic growth," Journal of Development Economics, Elsevier, vol. 62(1), pages 1-23, June.
    4. Matteo Cervellati & Uwe Sunde, 2005. "Human Capital Formation, Life Expectancy, and the Process of Development," American Economic Review, American Economic Association, vol. 95(5), pages 1653-1672, December.
    5. Gary S. Becker & Tomas J. Philipson & Rodrigo R. Soares, 2005. "The Quantity and Quality of Life and the Evolution of World Inequality," American Economic Review, American Economic Association, vol. 95(1), pages 277-291, March.
    6. Théophile T. Azomahou & Raouf Boucekkine & Bity Diene, 2009. "A closer look at the relationship between life expectancy and economic growth," International Journal of Economic Theory, The International Society for Economic Theory, vol. 5(2), pages 201-244, June.
    7. Hartwig, Jochen, 2008. "What drives health care expenditure?--Baumol's model of 'unbalanced growth' revisited," Journal of Health Economics, Elsevier, vol. 27(3), pages 603-623, May.
    8. Chakraborty, Shankha, 2004. "Endogenous lifetime and economic growth," Journal of Economic Theory, Elsevier, vol. 116(1), pages 119-137, May.
    9. David de la Croix & Omar Licandro, 2013. "The Child is Father Of the Man: Implications for the Demographic Transition," Economic Journal, Royal Economic Society, vol. 123(567), pages 236-261, March.
    10. Eeckhoudt, Louis & Pestieau, Pierre, 2008. "A note on longevity enhancing investment," Economics Letters, Elsevier, vol. 101(1), pages 57-59, October.
    11. Charles I. Jones & Peter J. Klenow, 2016. "Beyond GDP? Welfare across Countries and Time," American Economic Review, American Economic Association, vol. 106(9), pages 2426-2457, September.
    12. García-Gómez, Pilar & Jones, Andrew M. & Rice, Nigel, 2010. "Health effects on labour market exits and entries," Labour Economics, Elsevier, vol. 17(1), pages 62-76, January.
    13. Dwyer, Debra Sabatini & Mitchell, Olivia S., 1999. "Health problems as determinants of retirement: Are self-rated measures endogenous?," Journal of Health Economics, Elsevier, vol. 18(2), pages 173-193, April.
    14. Rodrigo R. Soares, 2005. "Mortality Reductions, Educational Attainment, and Fertility Choice," American Economic Review, American Economic Association, vol. 95(3), pages 580-601, June.
    15. Kuhn, Michael & Prettner, Klaus, 2016. "Growth and welfare effects of health care in knowledge-based economies," Journal of Health Economics, Elsevier, vol. 46(C), pages 100-119.
    16. Tomas J. Philipson & Gary S. Becker, 1998. "Old-Age Longevity and Mortality-Contingent Claims," Journal of Political Economy, University of Chicago Press, vol. 106(3), pages 551-573, June.
    17. Michael C. M. Leung & Yong Wang, 2010. "Endogenous Health Care, Life Expectancy And Economic Growth," Pacific Economic Review, Wiley Blackwell, vol. 15(1), pages 11-31, February.
    18. Felix Reichling & Kent Smetters, 2015. "Optimal Annuitization with Stochastic Mortality and Correlated Medical Costs," American Economic Review, American Economic Association, vol. 105(11), pages 3273-3320, November.
    19. David Cutler & Angus Deaton & Adriana Lleras-Muney, 2006. "The Determinants of Mortality," Journal of Economic Perspectives, American Economic Association, vol. 20(3), pages 97-120, Summer.
    20. Matthias Doepke, 2004. "Accounting for Fertility Decline During the Transition to Growth," Journal of Economic Growth, Springer, vol. 9(3), pages 347-383, September.
    21. Lichtenberg, Frank R., 2004. "Sources of U.S. longevity increase, 1960-2001," The Quarterly Review of Economics and Finance, Elsevier, vol. 44(3), pages 369-389, July.
    22. Bell, Clive & Gersbach, Hans, 2009. "The macroeconomics of targeting: the case of an enduring epidemic," Journal of Health Economics, Elsevier, vol. 28(1), pages 54-72, January.
    23. Robert E. Hall & Charles I. Jones, 2007. "The Value of Life and the Rise in Health Spending," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 122(1), pages 39-72.
    24. Kalemli-Ozcan, Sebnem, 2002. "Does the Mortality Decline Promote Economic Growth?," Journal of Economic Growth, Springer, vol. 7(4), pages 411-439, December.
    25. Disney, Richard & Emmerson, Carl & Wakefield, Matthew, 2006. "Ill health and retirement in Britain: A panel data-based analysis," Journal of Health Economics, Elsevier, vol. 25(4), pages 621-649, July.
    26. Kuhn, Michael & Wrzaczek, Stefan & Prskawetz, Alexia & Feichtinger, Gustav, 2015. "Optimal choice of health and retirement in a life-cycle model," Journal of Economic Theory, Elsevier, vol. 158(PA), pages 186-212.
    27. Ken-ichi Hashimoto & Ken Tabata, 2010. "Population aging, health care, and growth," Journal of Population Economics, Springer;European Society for Population Economics, vol. 23(2), pages 571-593, March.
    28. Eugenio Zucchelli & Andrew M. Jones & Nigel Rice & Anthony Harris, 2010. "The Effects of Health Shocks on labour Market Exits: Evidence from the HILDA Survey," Australian Journal of Labour Economics (AJLE), Bankwest Curtin Economics Centre (BCEC), Curtin Business School, vol. 13(2), pages 191-218.
    29. Shankha Chakraborty & Mausumi Das, 2005. "Mortality, Human Capital and Persistent Inequality," Journal of Economic Growth, Springer, vol. 10(2), pages 159-192, June.
    30. Moshe Hazan & Hosny Zoabi, 2006. "Does longevity cause growth? A theoretical critique," Journal of Economic Growth, Springer, vol. 11(4), pages 363-376, December.
    31. Alwyn Young, 2005. "The Gift of the Dying: The Tragedy of AIDS and the Welfare of Future African Generations," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 120(2), pages 423-466.
    32. Blanchard, Olivier J, 1985. "Debt, Deficits, and Finite Horizons," Journal of Political Economy, University of Chicago Press, vol. 93(2), pages 223-247, April.
    33. Raquel Fonseca Benito & Pierre-Carl Michaud & Titus Galama & Arie Kapteyn, 2009. "On the Rise of Health Spending and Longevity," Working Papers WR-722, RAND Corporation.
    34. Siew Ling Yew & Jie Zhang, 2018. "Health spending, savings and fertility in a lifecycle‐dynastic model with longevity externalities," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 51(1), pages 186-215, February.
    35. Boucekkine, Raouf & de la Croix, David & Licandro, Omar, 2002. "Vintage Human Capital, Demographic Trends, and Endogenous Growth," Journal of Economic Theory, Elsevier, vol. 104(2), pages 340-375, June.
    36. Sarah Brown & Jennifer Roberts & Karl Taylor, 2010. "Reservation wages, labour market participation and health," Journal of the Royal Statistical Society Series A, Royal Statistical Society, vol. 173(3), pages 501-529, July.
    37. Joseph P. Newhouse, 1992. "Medical Care Costs: How Much Welfare Loss?," Journal of Economic Perspectives, American Economic Association, vol. 6(3), pages 3-21, Summer.
    38. Davies, James B. & Kuhn, Peter, 1992. "Social security, longevity, and moral hazard," Journal of Public Economics, Elsevier, vol. 49(1), pages 91-106, October.
    39. Andreas Irmen, 2017. "Capital‐ And Labor‐Saving Technical Change In An Aging Economy," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 58(1), pages 261-285, February.
    40. Aisa, Rosa & Pueyo, Fernando, 2006. "Government health spending and growth in a model of endogenous longevity," Economics Letters, Elsevier, vol. 90(2), pages 249-253, February.
    41. Rosen, Sherwin, 1988. "The Value of Changes in Life Expectancy," Journal of Risk and Uncertainty, Springer, vol. 1(3), pages 285-304, September.
    42. Rob Rusconi, 2008. "National Annuity Markets: Features and Implications," OECD Working Papers on Insurance and Private Pensions 24, OECD Publishing.
    43. Carl-Johan Dalgaard & Holger Strulik, 2014. "Optimal Aging And Death: Understanding The Preston Curve," Journal of the European Economic Association, European Economic Association, vol. 12(3), pages 672-701, June.
    44. Zhao, Kai, 2014. "Social security and the rise in health spending," Journal of Monetary Economics, Elsevier, vol. 64(C), pages 21-37.
    45. Jie Zhang & Junsen Zhang & Michael C.M. Leung, 2006. "Health investment, saving, and public policy," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 39(1), pages 68-93, February.
    46. Roozbeh Hosseini, 2015. "Adverse Selection in the Annuity Market and the Role for Social Security," Journal of Political Economy, University of Chicago Press, vol. 123(4), pages 941-984.
    47. Heijdra, Ben J. & Mierau, Jochen O., 2012. "The individual life-cycle, annuity market imperfections and economic growth," Journal of Economic Dynamics and Control, Elsevier, vol. 36(6), pages 876-890.
    48. Bhattacharya, Joydeep & Qiao, Xue, 2005. "Public and Private Expenditures on Health in a Growth Model," Staff General Research Papers Archive 12378, Iowa State University, Department of Economics.
    49. Menahem E. Yaari, 1965. "Uncertain Lifetime, Life Insurance, and the Theory of the Consumer," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 32(2), pages 137-150.
    50. Calvo, Guillermo A & Obstfeld, Maurice, 1988. "Optimal Time-Consistent Fiscal Policy with Finite Lifetimes," Econometrica, Econometric Society, vol. 56(2), pages 411-432, March.
    51. Frank Caliendo & Nick Guo & Roozbeh Hosseini, 2014. "Social Security is NOT a Substitute for Annuity Markets," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 17(4), pages 739-755, October.
    52. Cannon, Edmund & Tonks, Ian, 2008. "Annuity Markets," OUP Catalogue, Oxford University Press, number 9780199216994.
    53. Schneider, Maik T. & Traeger, Christian P. & Winkler, Ralph, 2012. "Trading off generations: Equity, discounting, and climate change," European Economic Review, Elsevier, vol. 56(8), pages 1621-1644.
    54. Charles I. Jones, 2016. "Life and Growth," Journal of Political Economy, University of Chicago Press, vol. 124(2), pages 539-578.
    55. Clive Bell & Shantayanan Devarajan & Hans Gersbach, 2006. "The Long-Run Economic Costs of aids: A Model with an Application to South Africa," The World Bank Economic Review, World Bank, vol. 20(1), pages 55-89.
    56. Blackburn, Keith & Cipriani, Giam Pietro, 2002. "A model of longevity, fertility and growth," Journal of Economic Dynamics and Control, Elsevier, vol. 26(2), pages 187-204, February.
    57. Kevin M. Murphy & Robert H. Topel, 2006. "The Value of Health and Longevity," Journal of Political Economy, University of Chicago Press, vol. 114(5), pages 871-904, October.
    58. Fonseca, Raquel & Michaud, Pierre-Carl & Galama, Titus & Kapteyn, Arie, 2009. "On The Rise of Health Spending and Longevity," IZA Discussion Papers 4622, Institute for the Study of Labor (IZA).
    59. Echevarria, Cruz A. & Iza, Amaia, 2006. "Life expectancy, human capital, social security and growth," Journal of Public Economics, Elsevier, vol. 90(12), pages 2323-2349, December.
    60. van Zon, Adriaan & Muysken, Joan, 2001. "Health and endogenous growth," Journal of Health Economics, Elsevier, vol. 20(2), pages 169-185, March.
    61. Heijdra, Ben J. & Mierau, Jochen O. & Reijnders, S. M., 2014. "A Tragedy Of Annuitization? Longevity Insurance In General Equilibrium," Macroeconomic Dynamics, Cambridge University Press, vol. 18(7), pages 1607-1634, October.
    62. Zafer Caliskan, 2009. "The relationship between pharmaceutical expenditure and life expectancy: evidence from 21 OECD countries," Applied Economics Letters, Taylor & Francis Journals, vol. 16(16), pages 1651-1655.
    63. Bates, Laurie J. & Santerre, Rexford E., 2013. "Does the U.S. health care sector suffer from Baumol's cost disease? Evidence from the 50 states," Journal of Health Economics, Elsevier, vol. 32(2), pages 386-391.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Torben M. Andersen & Joydeep Bhattacharya, 2014. "A dynamic-efficiency rationale for public investment in the health of the young," Canadian Journal of Economics, Canadian Economics Association, vol. 47(3), pages 697-719, August.
    2. Kelly, Mark, 2020. "Medicare for all or medicare for none? A macroeconomic analysis of healthcare reform," Journal of Macroeconomics, Elsevier, vol. 63(C).
    3. Klaus Prettner, 2013. "Population aging and endogenous economic growth," Journal of Population Economics, Springer;European Society for Population Economics, vol. 26(2), pages 811-834, April.
    4. Kuhn, Michael & Frankovic, Ivan & Wrzaczek, Stefan, 2017. "Medical Progress, Demand for Health Care, and Economic Performance," VfS Annual Conference 2017 (Vienna): Alternative Structures for Money and Banking 168249, Verein für Socialpolitik / German Economic Association.
    5. Ivan Frankovic & Michael Kuhn & Stefan Wrzaczek, 2016. "Medical Care within an OLG Economy with Realistic Demography," VID Working Papers 1603, Vienna Institute of Demography (VID) of the Austrian Academy of Sciences in Vienna.
    6. Annarita Baldanzi & Klaus Prettner & Paul Tscheuschner, 2019. "Longevity-induced vertical innovation and the tradeoff between life and growth," Journal of Population Economics, Springer;European Society for Population Economics, vol. 32(4), pages 1293-1313, October.
    7. Bloom, David E. & Kuhn, Michael & Prettner, Klaus, 2018. "Health and Economic Growth," IZA Discussion Papers 11939, Institute of Labor Economics (IZA).
    8. Kuhn, Michael & Prettner, Klaus, 2016. "Growth and welfare effects of health care in knowledge-based economies," Journal of Health Economics, Elsevier, vol. 46(C), pages 100-119.
    9. Belyakov, A.O. & Kurbatskiy, A.N. & Prettner, K., 2021. "The growth effects of anticipated versus unanticipated population aging," Journal of Mathematical Economics, Elsevier, vol. 94(C).
    10. Kuhn, Michael & Minniti, Antonio & Prettner, Klaus & Venturini, Francesco, 2023. "Medical innovation, life expectancy, and economic growth," Department of Economics Working Paper Series 342, WU Vienna University of Economics and Business.
    11. Andreas Schaefer, 2020. "Inequality, survival to adulthood, and the growth drag of pollution," Oxford Economic Papers, Oxford University Press, vol. 72(1), pages 59-79.
    12. Ivan Frankovic & Michael Kuhn & Stefan Wrzaczek, 2020. "On the Anatomy of Medical Progress Within an Overlapping Generations Economy," De Economist, Springer, vol. 168(2), pages 215-257, June.
    13. Frankovic, Ivan & Kuhn, Michael, 2023. "Health insurance, endogenous medical progress, health expenditure growth, and welfare," Journal of Health Economics, Elsevier, vol. 87(C).
    14. Michael Kuhn & Klaus Prettner, 2018. "Population age structure and consumption growth: evidence from National Transfer Accounts," Journal of Population Economics, Springer;European Society for Population Economics, vol. 31(1), pages 135-153, January.
    15. Pintu Parui & Klaus Prettner, 2024. "Public provision of healthcare and basic science: What are the effects on economic growth and welfare?," Department of Economics Working Papers wuwp365, Vienna University of Economics and Business, Department of Economics.
    16. Frankovic, Ivan & Kuhn, Michael, 2018. "Health insurance, endogenous medical progress, and health expenditure growth," ECON WPS - Working Papers in Economic Theory and Policy 01/2018, TU Wien, Institute of Statistics and Mathematical Methods in Economics, Economics Research Unit.
    17. Frankovic, Ivan & Kuhn, Michael, 2019. "Access to health care, medical progress and the emergence of the longevity gap: A general equilibrium analysis," The Journal of the Economics of Ageing, Elsevier, vol. 14(C).

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Kuhn, Michael & Prettner, Klaus, 2016. "Growth and welfare effects of health care in knowledge-based economies," Journal of Health Economics, Elsevier, vol. 46(C), pages 100-119.
    2. Bloom, David E. & Kuhn, Michael & Prettner, Klaus, 2018. "Health and Economic Growth," IZA Discussion Papers 11939, Institute of Labor Economics (IZA).
    3. Kuhn, Michael & Frankovic, Ivan & Wrzaczek, Stefan, 2017. "Medical Progress, Demand for Health Care, and Economic Performance," VfS Annual Conference 2017 (Vienna): Alternative Structures for Money and Banking 168249, Verein für Socialpolitik / German Economic Association.
    4. Francesco Ricci & Marios Zachariadis, 2013. "Education Externalities on Longevity," Economica, London School of Economics and Political Science, vol. 80(319), pages 404-440, July.
    5. Frankovic, Ivan & Kuhn, Michael & Wrzaczek, Stefan, 2016. "Medical care within an OLG economy with realistic demography," ECON WPS - Working Papers in Economic Theory and Policy 02/2016, TU Wien, Institute of Statistics and Mathematical Methods in Economics, Economics Research Unit.
    6. David de la Croix & Omar Licandro, 2013. "The Child is Father Of the Man: Implications for the Demographic Transition," Economic Journal, Royal Economic Society, vol. 123(567), pages 236-261, March.
    7. Kuhn, Michael & Wrzaczek, Stefan & Prskawetz, Alexia & Feichtinger, Gustav, 2015. "Optimal choice of health and retirement in a life-cycle model," Journal of Economic Theory, Elsevier, vol. 158(PA), pages 186-212.
    8. Frankovic, Ivan & Kuhn, Michael & Wrzaczek, Stefan, 2020. "Medical innovation and its diffusion: Implications for economic performance and welfare," Journal of Macroeconomics, Elsevier, vol. 66(C).
    9. Weil, David N., 2014. "Health and Economic Growth," Handbook of Economic Growth, in: Philippe Aghion & Steven Durlauf (ed.), Handbook of Economic Growth, edition 1, volume 2, chapter 3, pages 623-682, Elsevier.
    10. Ivan Frankovic & Michael Kuhn & Stefan Wrzaczek, 2020. "On the Anatomy of Medical Progress Within an Overlapping Generations Economy," De Economist, Springer, vol. 168(2), pages 215-257, June.
    11. Pierre Pestieau & Gregory Ponthiere, 2012. "The Public Economics of Increasing Longevity," Hacienda Pública Española / Review of Public Economics, IEF, vol. 200(1), pages 41-74, March.
    12. David E. Bloom & Michael Kuhn & Klaus Prettner, 2022. "Modern Infectious Diseases: Macroeconomic Impacts and Policy Responses," Journal of Economic Literature, American Economic Association, vol. 60(1), pages 85-131, March.
    13. Annarita Baldanzi & Klaus Prettner & Paul Tscheuschner, 2019. "Longevity-induced vertical innovation and the tradeoff between life and growth," Journal of Population Economics, Springer;European Society for Population Economics, vol. 32(4), pages 1293-1313, October.
    14. Amparo Castelló‐Climent & Rafael Doménech, 2008. "Human Capital Inequality, Life Expectancy And Economic Growth," Economic Journal, Royal Economic Society, vol. 118(528), pages 653-677, April.
    15. Luciano Fanti & Luca Gori, 2014. "Endogenous fertility, endogenous lifetime and economic growth: the role of child policies," Journal of Population Economics, Springer;European Society for Population Economics, vol. 27(2), pages 529-564, April.
    16. Frankovic, Ivan & Kuhn, Michael, 2018. "Health insurance, endogenous medical progress, and health expenditure growth," ECON WPS - Working Papers in Economic Theory and Policy 01/2018, TU Wien, Institute of Statistics and Mathematical Methods in Economics, Economics Research Unit.
    17. Stelter, Robert, 2014. "Over-aging: Are present human populations too old?," Thuenen-Series of Applied Economic Theory 137, University of Rostock, Institute of Economics.
    18. Sunde, Uwe & Cervellati, Matteo, 2007. "Human Capital, Mortality and Fertility: A Unified Theory of the Economic and Demographic Transition," CEPR Discussion Papers 6384, C.E.P.R. Discussion Papers.
    19. Gehringer, Agnieszka & Prettner, Klaus, 2019. "Longevity And Technological Change," Macroeconomic Dynamics, Cambridge University Press, vol. 23(4), pages 1471-1503, June.
    20. Matteo Cervellati & Uwe Sunde, 2011. "Life expectancy and economic growth: the role of the demographic transition," Journal of Economic Growth, Springer, vol. 16(2), pages 99-133, June.

    More about this item

    Keywords

    economic growth; endogenous longevity; healthcare expenditures; healthcare technology; quality-quantity trade-off;
    All these keywords.

    JEL classification:

    • O40 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - General
    • I10 - Health, Education, and Welfare - - Health - - - General
    • J10 - Labor and Demographic Economics - - Demographic Economics - - - General

    NEP fields

    This paper has been announced in the following NEP Reports:

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eth:wpswif:10-137. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: the person in charge (email available below). General contact details of provider: https://edirc.repec.org/data/iwethch.html .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.