IDEAS home Printed from https://ideas.repec.org/p/pra/mprapa/107588.html
   My bibliography  Save this paper

Parental Time Investment and Intergenerational Mobility

Author

Listed:
  • Yum, Minchul

Abstract

This paper constructs a quantitative model of intergenerational mobility in which lifetime income mobility is shaped by various channels including parental time investments in children. The calibrated model delivers positive educational gradients in parental time investment, as observed in the data, and also successfully accounts for untargeted distributional aspects of income mobility, captured in the income quintile transition matrix. The model implies that removing the positive educational gradients in parental time investment during the whole childhood would reduce intergenerational income persistence nearly by 40 percent. Policy experiments suggest that subsidies to childhood investments that can diminish positive educational gradients in parental time investments would increase intergenerational mobility, and that there are better ways of subsidizing investments to achieve greater mobility in terms of aggregate output and welfare.

Suggested Citation

  • Yum, Minchul, 2020. "Parental Time Investment and Intergenerational Mobility," MPRA Paper 107588, University Library of Munich, Germany.
    • Handle: RePEc:pra:mprapa:107588
    as

    Download full text from publisher

    File URL: https://mpra.ub.uni-muenchen.de/107588/1/MPRA_paper_107588.pdf
    File Function: original version
    Download Restriction: no
    ---><---

    Other versions of this item:

    References listed on IDEAS

    as
    1. James Heckman & Flavio Cunha, 2007. "The Technology of Skill Formation," American Economic Review, American Economic Association, vol. 97(2), pages 31-47, May.
    2. Laura Chadwick & Gary Solon, 2002. "Intergenerational Income Mobility Among Daughters," American Economic Review, American Economic Association, vol. 92(1), pages 335-344, March.
    3. Garey Ramey & Valerie A. Ramey, 2010. "The Rug Rat Race," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 41(1 (Spring), pages 129-199.
    4. Daniela Del Boca & Christopher Flinn & Matthew Wiswall, 2014. "Household Choices and Child Development," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 81(1), pages 137-185.
    5. Rauh, Christopher, 2017. "Voting, education, and the Great Gatsby Curve," Journal of Public Economics, Elsevier, vol. 146(C), pages 1-14.
    6. Brant Abbott & Giovanni Gallipoli & Costas Meghir & Giovanni L. Violante, 2019. "Education Policy and Intergenerational Transfers in Equilibrium," Journal of Political Economy, University of Chicago Press, vol. 127(6), pages 2569-2624.
    7. Iacopo Morchio, 2022. "Policies for Early Childhood Skills Formation: Accounting for Parental Choices and Noncognitive Skills," Bristol Economics Discussion Papers 22/755, School of Economics, University of Bristol, UK.
    8. Elizabeth M. Caucutt & Lance Lochner, 2020. "Early and Late Human Capital Investments, Borrowing Constraints, and the Family," Journal of Political Economy, University of Chicago Press, vol. 128(3), pages 1065-1147.
    9. Behrman, Jere R & Pollak, Robert A & Taubman, Paul, 1982. "Parental Preferences and Provision for Progeny," Journal of Political Economy, University of Chicago Press, vol. 90(1), pages 52-73, February.
    10. Diego Restuccia & Carlos Urrutia, 2004. "Intergenerational Persistence of Earnings: The Role of Early and College Education," American Economic Review, American Economic Association, vol. 94(5), pages 1354-1378, December.
    11. Raj Chetty & Nathaniel Hendren & Patrick Kline & Emmanuel Saez & Nicholas Turner, 2014. "Is the United States Still a Land of Opportunity? Recent Trends in Intergenerational Mobility," American Economic Review, American Economic Association, vol. 104(5), pages 141-147, May.
    12. Nezih Guner & Remzi Kaygusuz & Gustavo Ventura, 2014. "Income Taxation of U.S. Households: Facts and Parametric Estimates," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 17(4), pages 559-581, October.
    13. Carneiro, Pedro & Heckman, James J., 2003. "Human Capital Policy," IZA Discussion Papers 821, Institute of Labor Economics (IZA).
    14. Flavio Cunha & James J. Heckman & Susanne M. Schennach, 2010. "Estimating the Technology of Cognitive and Noncognitive Skill Formation," Econometrica, Econometric Society, vol. 78(3), pages 883-931, May.
    15. Hans A. Holter & Dirk Krueger & Serhiy Stepanchuk, 2019. "How do tax progressivity and household heterogeneity affect Laffer curves?," Quantitative Economics, Econometric Society, vol. 10(4), pages 1317-1356, November.
    16. Igor Livshits & James MacGee & Michèle Tertilt, 2010. "Accounting for the Rise in Consumer Bankruptcies," American Economic Journal: Macroeconomics, American Economic Association, vol. 2(2), pages 165-193, April.
    17. James J. Heckman & Jora Stixrud & Sergio Urzua, 2006. "The Effects of Cognitive and Noncognitive Abilities on Labor Market Outcomes and Social Behavior," Journal of Labor Economics, University of Chicago Press, vol. 24(3), pages 411-482, July.
    18. Antonio Ciccone & Giovanni Peri, 2005. "Long-Run Substitutability Between More and Less Educated Workers: Evidence from U.S. States, 1950-1990," The Review of Economics and Statistics, MIT Press, vol. 87(4), pages 652-663, November.
    19. Steven Haider & Gary Solon, 2006. "Life-Cycle Variation in the Association between Current and Lifetime Earnings," American Economic Review, American Economic Association, vol. 96(4), pages 1308-1320, September.
    20. Raj Chetty & Adam Guren & Day Manoli & Andrea Weber, 2013. "Does Indivisible Labor Explain the Difference between Micro and Macro Elasticities? A Meta-Analysis of Extensive Margin Elasticities," NBER Macroeconomics Annual, University of Chicago Press, vol. 27(1), pages 1-56.
    21. S. Rao Aiyagari, 1994. "Uninsured Idiosyncratic Risk and Aggregate Saving," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 109(3), pages 659-684.
    22. Raj Chetty & Nathaniel Hendren & Patrick Kline & Emmanuel Saez, 2014. "Where is the land of Opportunity? The Geography of Intergenerational Mobility in the United States," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 129(4), pages 1553-1623.
    23. Mariacristina De Nardi, 2004. "Wealth Inequality and Intergenerational Links," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 71(3), pages 743-768.
    24. James J. Heckman, 2008. "Schools, Skills, And Synapses," Economic Inquiry, Western Economic Association International, vol. 46(3), pages 289-324, July.
    25. Rupert, Peter & Zanella, Giulio, 2015. "Revisiting wage, earnings, and hours profiles," Journal of Monetary Economics, Elsevier, vol. 72(C), pages 114-130.
    26. Keane, Michael P & Wolpin, Kenneth I, 1997. "The Career Decisions of Young Men," Journal of Political Economy, University of Chicago Press, vol. 105(3), pages 473-522, June.
    27. Minchul Yum, 2023. "Parental Time Investment And Intergenerational Mobility," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 64(1), pages 187-223, February.
    28. Mark Huggett & Gustavo Ventura & Amir Yaron, 2011. "Sources of Lifetime Inequality," American Economic Review, American Economic Association, vol. 101(7), pages 2923-2954, December.
    29. Jonathan Heathcote & Fabrizio Perri & Giovanni L. Violante, 2010. "Unequal We Stand: An Empirical Analysis of Economic Inequality in the United States: 1967-2006," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 13(1), pages 15-51, January.
    30. James Heckman & Rodrigo Pinto & Peter Savelyev, 2013. "Understanding the Mechanisms through Which an Influential Early Childhood Program Boosted Adult Outcomes," American Economic Review, American Economic Association, vol. 103(6), pages 2052-2086, October.
    31. Christopher Herrington, 2015. "Public Education Financing, Earnings Inequality, and Intergenerational Mobility," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 18(4), pages 822-842, October.
    32. Nezih Guner & Remzi Kaygusuz & Gustavo Ventura, 2014. "Income Taxation of U.S. Households: Facts and Parametric Estimates," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 17(4), pages 559-581, October.
    33. Black, Sandra E. & Devereux, Paul J., 2011. "Recent Developments in Intergenerational Mobility," Handbook of Labor Economics, in: O. Ashenfelter & D. Card (ed.), Handbook of Labor Economics, edition 1, volume 4, chapter 16, pages 1487-1541, Elsevier.
    34. Elizabeth M. Caucutt & Lance Lochner & Joseph Mullins & Youngmin Park, 2020. "Child Skill Production: Accounting for Parental and Market-Based Time and Goods Investments," NBER Working Papers 27838, National Bureau of Economic Research, Inc.
    35. Philip Babcock & Mindy Marks, 2011. "The Falling Time Cost of College: Evidence from Half a Century of Time Use Data," The Review of Economics and Statistics, MIT Press, vol. 93(2), pages 468-478, May.
    36. Hans A. Holter, 2015. "Accounting for cross‐country differences in intergenerational earnings persistence: The impact of taxation and public education expenditure," Quantitative Economics, Econometric Society, vol. 6(2), pages 385-428, July.
    37. Zhu, Guozhong & Vural, Gulfer, 2013. "Inter-generational effect of parental time and its policy implications," Journal of Economic Dynamics and Control, Elsevier, vol. 37(9), pages 1833-1851.
    38. Roland Benabou, 2002. "Tax and Education Policy in a Heterogeneous-Agent Economy: What Levels of Redistribution Maximize Growth and Efficiency?," Econometrica, Econometric Society, vol. 70(2), pages 481-517, March.
    39. Cantore, C. & Levine, P., 2012. "Getting normalization right: Dealing with ‘dimensional constants’ in macroeconomics," Journal of Economic Dynamics and Control, Elsevier, vol. 36(12), pages 1931-1949.
    40. Youderian, Xiaoyan, 2019. "Human Capital Production With Parental Time Investment In Early Childhood," Macroeconomic Dynamics, Cambridge University Press, vol. 23(4), pages 1504-1527, June.
    41. Gary S. Becker & Nigel Tomes, 1994. "Human Capital and the Rise and Fall of Families," NBER Chapters, in: Human Capital: A Theoretical and Empirical Analysis with Special Reference to Education, Third Edition, pages 257-298, National Bureau of Economic Research, Inc.
    42. Jonathan Heathcote & Kjetil Storesletten & Giovanni L. Violante, 2014. "Consumption and Labor Supply with Partial Insurance: An Analytical Framework," American Economic Review, American Economic Association, vol. 104(7), pages 2075-2126, July.
    43. Michael Baker & Jonathan Gruber & Kevin Milligan, 2008. "Universal Child Care, Maternal Labor Supply, and Family Well-Being," Journal of Political Economy, University of Chicago Press, vol. 116(4), pages 709-745, August.
    44. Fernandez, Raquel & Rogerson, Richard, 1998. "Public Education and Income Distribution: A Dynamic Quantitative Evaluation of Education-Finance Reform," American Economic Review, American Economic Association, vol. 88(4), pages 813-833, September.
    45. Diego Daruich, 2018. "The Macroeconomic Consequences of Early Childhood Development Policies," Working Papers 2018-010, Human Capital and Economic Opportunity Working Group.
    46. Huggett, Mark, 1993. "The risk-free rate in heterogeneous-agent incomplete-insurance economies," Journal of Economic Dynamics and Control, Elsevier, vol. 17(5-6), pages 953-969.
    47. Erosa, Andres & Koreshkova, Tatyana, 2007. "Progressive taxation in a dynastic model of human capital," Journal of Monetary Economics, Elsevier, vol. 54(3), pages 667-685, April.
    48. Solon, Gary, 1999. "Intergenerational mobility in the labor market," Handbook of Labor Economics, in: O. Ashenfelter & D. Card (ed.), Handbook of Labor Economics, edition 1, volume 3, chapter 29, pages 1761-1800, Elsevier.
    49. Jonathan Guryan & Erik Hurst & Melissa Kearney, 2008. "Parental Education and Parental Time with Children," Journal of Economic Perspectives, American Economic Association, vol. 22(3), pages 23-46, Summer.
    50. Matthew T. Johnson, 2013. "Borrowing Constraints, College Enrollment, and Delayed Entry," Journal of Labor Economics, University of Chicago Press, vol. 31(4), pages 669-725.
    51. repec:mpr:mprres:7891 is not listed on IDEAS
    52. Blau, David & Currie, Janet, 2006. "Pre-School, Day Care, and After-School Care: Who's Minding the Kids?," Handbook of the Economics of Education, in: Erik Hanushek & F. Welch (ed.), Handbook of the Economics of Education, edition 1, volume 2, chapter 20, pages 1163-1278, Elsevier.
    53. Chul-In Lee & Gary Solon, 2009. "Trends in Intergenerational Income Mobility," The Review of Economics and Statistics, MIT Press, vol. 91(4), pages 766-772, November.
    54. Bruce Sacerdote, 2007. "How Large are the Effects from Changes in Family Environment? A Study of Korean American Adoptees," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 122(1), pages 119-157.
    55. Matthew T. Johnson, 2013. "Borrowing Constraints, College Enrollment, and Delayed Entry," Mathematica Policy Research Reports 57fc00235c3a47ff92cb253f9, Mathematica Policy Research.
    56. Solon, Gary, 1992. "Intergenerational Income Mobility in the United States," American Economic Review, American Economic Association, vol. 82(3), pages 393-408, June.
    57. Per Krusell & Anthony A. Smith & Jr., 1998. "Income and Wealth Heterogeneity in the Macroeconomy," Journal of Political Economy, University of Chicago Press, vol. 106(5), pages 867-896, October.
    58. Sang Yoon (Tim) Lee & Ananth Seshadri, 2019. "On the Intergenerational Transmission of Economic Status," Journal of Political Economy, University of Chicago Press, vol. 127(2), pages 855-921.
    59. Giulio Zanella & Peter Rupert, 2010. "Revisiting Wage, Earnings, and Hours Profiles," 2010 Meeting Papers 1158, Society for Economic Dynamics.
    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. Suzanne Bellue, 2024. "Why Don’t Poor Families Move? A Spatial Equilibrium Analysis of Parental Decisions with Social Learning," Working Papers 2024-07, Center for Research in Economics and Statistics.
    2. Diego Daruich & Julian Kozlowski, 2020. "Explaining Intergenerational Mobility: The Role of Fertility and Family Transfers," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 36, pages 220-245, April.
    3. Minchul Yum, 2023. "Parental Time Investment And Intergenerational Mobility," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 64(1), pages 187-223, February.
    4. Nicola Fuchs-Schündeln & Dirk Krueger & André Kurmann & Etienne Lalé & Alexander Ludwig & Irina Popova, 2023. "The Fiscal and Welfare Effects of Policy Responses to the Covid-19 School Closures," IMF Economic Review, Palgrave Macmillan;International Monetary Fund, vol. 71(1), pages 35-98, March.
    5. Nicola Fuchs-Schünde & Dirk Krueger & Alexander Ludwig & Irina Popova, 2022. "The Long-Term Distributional and Welfare Effects of Covid-19 School Closures," The Economic Journal, Royal Economic Society, vol. 132(645), pages 1647-1683.
    6. Iacopo Morchio, 2022. "Policies for Early Childhood Skills Formation: Accounting for Parental Choices and Noncognitive Skills," Bristol Economics Discussion Papers 22/755, School of Economics, University of Bristol, UK.
    7. Youngsoo Jang & Minchul Yum, 2020. "Aggregate and Intergenerational Implications of School Closures: A Quantitative Assessment," CRC TR 224 Discussion Paper Series crctr224_2020_234v1, University of Bonn and University of Mannheim, Germany.
    8. Bechlioulis, Alexandros P. & Brissimis, Sophocles N., 2019. "Consumer debt non-payment and the borrowing constraint: Implications for consumer behavior," Journal of Banking & Finance, Elsevier, vol. 101(C), pages 161-172.
    9. Grübl, Dominik & Lackner, Mario & Winter-Ebmer, Rudolf, 2020. "Intergenerational Transmission of Unemployment - Causal Evidence from Austria," IHS Working Paper Series 14, Institute for Advanced Studies.
    10. Cynthia Bansak & Martha Starr, 2021. "Covid-19 shocks to education supply: how 200,000 U.S. households dealt with the sudden shift to distance learning," Review of Economics of the Household, Springer, vol. 19(1), pages 63-90, March.
    11. Bansak, Cynthia & Jiang, Xuan & Yang, Guanyi, 2022. "Sibling spillovers in rural China: A story of sisters," China Economic Review, Elsevier, vol. 76(C).
    12. Bansak, Cynthia & Jiang, Xuan & Yang, Guanyi, 2020. "Sibling Spillover in Rural China: A Story of Sisters and Daughters," IZA Discussion Papers 13127, Institute of Labor Economics (IZA).
    13. Diego Daruich, 2017. "From Childhood to Adult Inequality: Parental Investments and Early Childhood Development," 2017 Meeting Papers 770, Society for Economic Dynamics.
    14. Diego Daruich, 2018. "The Macroeconomic Consequences of Early Childhood Development Policies," Working Papers 2018-010, Human Capital and Economic Opportunity Working Group.
    15. Yang, Guanyi & Bansak, Cynthia, 2020. "Does wealth matter? An assessment of China's rural-urban migration on the education of left-behind children," China Economic Review, Elsevier, vol. 59(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. Youngsoo Jang & Minchul Yum, 2020. "Aggregate and Intergenerational Implications of School Closures: A Quantitative Assessment," CRC TR 224 Discussion Paper Series crctr224_2020_234v1, University of Bonn and University of Mannheim, Germany.
    2. Minchul Yum, 2015. "Parental Time Investment and Human Capital Formation: A Quantitative Analysis of Intergenerational Mobility," 2015 Meeting Papers 996, Society for Economic Dynamics.
    3. Iacopo Morchio, 2022. "Policies for Early Childhood Skills Formation: Accounting for Parental Choices and Noncognitive Skills," Bristol Economics Discussion Papers 22/755, School of Economics, University of Bristol, UK.
    4. Gianluca Violante & Giovanni Gallipoli & Costas Meghir, 2005. "Education Decisions, Equilibrium Policies and Wages Dispersion," 2005 Meeting Papers 522, Society for Economic Dynamics.
    5. Brant Abbott & Giovanni Gallipoli & Costas Meghir & Giovanni L. Violante, 2019. "Education Policy and Intergenerational Transfers in Equilibrium," Journal of Political Economy, University of Chicago Press, vol. 127(6), pages 2569-2624.
    6. Uta Bolt & Eric French & Jamie Hentall-MacCuish & Cormac O'Dea, 2021. "The intergenerational elasticity of earnings: exploring the mechanisms," IFS Working Papers W21/07, Institute for Fiscal Studies.
    7. Rauh, Christopher, 2017. "Voting, education, and the Great Gatsby Curve," Journal of Public Economics, Elsevier, vol. 146(C), pages 1-14.
    8. Christopher Rauh, 2015. "The Political Economy of Early and College Education - Can Voting Bend the Great Gatsby Curve?," 2015 Meeting Papers 82, Society for Economic Dynamics.
    9. Gallipoli, Giovanni & Low, Hamish & Mitra, Aruni, 2020. "Consumption and Income Inequality across Generations," CEPR Discussion Papers 15166, C.E.P.R. Discussion Papers.
    10. Elizabeth M. Caucutt & Lance Lochner, 2020. "Early and Late Human Capital Investments, Borrowing Constraints, and the Family," Journal of Political Economy, University of Chicago Press, vol. 128(3), pages 1065-1147.
    11. Nicola Fuchs-Schündeln & Dirk Krueger & André Kurmann & Etienne Lalé & Alexander Ludwig & Irina Popova, 2023. "The Fiscal and Welfare Effects of Policy Responses to the Covid-19 School Closures," IMF Economic Review, Palgrave Macmillan;International Monetary Fund, vol. 71(1), pages 35-98, March.
    12. Brotherhood, Luiz & Delalibera, Bruno R., 2020. "Minding the gap between schools and universities," Journal of Economic Dynamics and Control, Elsevier, vol. 120(C).
    13. Nicola Fuchs-Schünde & Dirk Krueger & Alexander Ludwig & Irina Popova, 2022. "The Long-Term Distributional and Welfare Effects of Covid-19 School Closures," The Economic Journal, Royal Economic Society, vol. 132(645), pages 1647-1683.
    14. Diego Daruich & Julian Kozlowski, 2020. "Explaining Intergenerational Mobility: The Role of Fertility and Family Transfers," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 36, pages 220-245, April.
    15. Francesconi, Marco & Heckman, James J, 2015. "Symposium on Child Development and Parental Investment: Introduction," Economics Discussion Papers 16868, University of Essex, Department of Economics.
    16. Uta Bolt & Eric French & Jamie Hentall Maccuish & Cormac O’Dea, 2018. "Intergenerational Altruism and Transfers of Time and Money: A Life-cycle Perspective," Working Papers wp379, University of Michigan, Michigan Retirement Research Center.
    17. James J. Heckman & Stefano Mosso, 2014. "The Economics of Human Development and Social Mobility," Annual Review of Economics, Annual Reviews, vol. 6(1), pages 689-733, August.
    18. Braxton, John Carter & Chikhale, Nisha & Herkenhoff, Kyle & Phillips, Gordon, 2024. "Intergenerational Mobility and Credit," IZA Discussion Papers 16826, Institute of Labor Economics (IZA).
    19. Elizabeth M. Caucutt & Lance Lochner & Youngmin Park, 2017. "Correlation, Consumption, Confusion, or Constraints: Why Do Poor Children Perform so Poorly?," Scandinavian Journal of Economics, Wiley Blackwell, vol. 119(1), pages 102-147, January.
    20. Doepke, M. & Tertilt, M., 2016. "Families in Macroeconomics," Handbook of Macroeconomics, in: J. B. Taylor & Harald Uhlig (ed.), Handbook of Macroeconomics, edition 1, volume 2, chapter 0, pages 1789-1891, Elsevier.

    More about this item

    Keywords

    Intergenerational elasticity; quintile transition matrix; parental investments; college education;
    All these keywords.

    JEL classification:

    • E24 - Macroeconomics and Monetary Economics - - Consumption, Saving, Production, Employment, and Investment - - - Employment; Unemployment; Wages; Intergenerational Income Distribution; Aggregate Human Capital; Aggregate Labor Productivity
    • I24 - Health, Education, and Welfare - - Education - - - Education and Inequality
    • J22 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Time Allocation and Labor Supply

    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:pra:mprapa:107588. 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: Joachim Winter (email available below). General contact details of provider: https://edirc.repec.org/data/vfmunde.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.