Base independence in the analysis of tax policy effects: with an application to Norway 1992-2004
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- Peter Lambert & Thor Thoresen, 2009. "Base independence in the analysis of tax policy effects: with an application to Norway 1992–2004," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 16(2), pages 219-252, April.
- Peter J. Lambert & Thor O. Thoresen, 2005. "Base independence in the analysis of tax policy effects: with an application to Norway 1992–2004," University of Oregon Economics Department Working Papers 2005-13, University of Oregon Economics Department, revised 27 Oct 2005.
References listed on IDEAS
- John Bishop & K. Chow & John Formby & Chih-Chin Ho, 1997. "Did Tax Reform Reduce Actual US Progressivity? Evidence from the Taxpayer Compliance Measurement Program," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 4(2), pages 177-197, May.
- John A. Bishop & K. Victor Chow & John P. Formby & C. C. Ho, "undated". "Tax Gaps and Tax Rates: New Evidence from the Taxpayer Compliance Measurement Program," Working Papers 9724, East Carolina University, Department of Economics.
- MacKinnon, James G. & White, Halbert & Davidson, Russell, 1983.
"Tests for model specification in the presence of alternative hypotheses : Some further results,"
Journal of Econometrics, Elsevier, vol. 21(1), pages 53-70, January.
- Russell Davidson & James G. MacKinnon, 1981. "Tests for Model Specification in the Presence of Alternative Hypotheses: Some Further Results," Working Paper 430, Economics Department, Queen's University.
- Slemrod,Joel, 1997.
"Tax Progressivity and Income Inequality,"
Cambridge Books,
Cambridge University Press, number 9780521587761, September.
- Slemrod,Joel, 1994. "Tax Progressivity and Income Inequality," Cambridge Books, Cambridge University Press, number 9780521465434, September.
- A.B. Atkinson & F. Bourguignon (ed.), 2000. "Handbook of Income Distribution," Handbook of Income Distribution, Elsevier, edition 1, volume 1, number 1.
- King, Mervyn A, 1983. "An Index of Inequality: With Applications to Horizontal Equity and Social Mobility," Econometrica, Econometric Society, vol. 51(1), pages 99-115, January.
- Jean-Yves Duclos & Peter J. Lambert, 2000. "A normative and statistical approach to measuring classical horizontal inequity," Canadian Journal of Economics, Canadian Economics Association, vol. 33(1), pages 87-113, February.
- Xavier Ramos & Peter J Lambert, "undated". "Horizontal Equity and Differences in Income Tax Treatment: A Reconciliation," Discussion Papers 98/24, Department of Economics, University of York.
- Alan J. Auerbach & Kevin A. Hassett, 2002.
"A New Measure of Horizontal Equity,"
American Economic Review, American Economic Association, vol. 92(4), pages 1116-1125, September.
- Alan J. Auerbach & Kevin A. Hassett, 1999. "A New Measure of Horizontal Equity," NBER Working Papers 7035, National Bureau of Economic Research, Inc.
- Musgrave, Richard A., 1990. "Horizontal Equity, Once More," National Tax Journal, National Tax Association, vol. 43(2), pages 113-22, June.
- Peter Lambert, & Xavier Ramos, 1995. "Vertical redistribution and horizontal inequity," IFS Working Papers W95/01, Institute for Fiscal Studies.
- Peter Lambert & Xavier Ramos, 1997. "Horizontal Inequity and Vertical Redistribution," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 4(1), pages 25-37, January.
- André Decoster & Erwin Ooghe, 2002. "Weighting with individuals, equivalent individuals, or not weighting at all. Does it matter empirically?," Public Economics Working Paper Series ces0215, Katholieke Universiteit Leuven, Centrum voor Economische Studiën, Working Group Public Economics.
- Aarbu, Karl O. & Thoresen, Thor O., 2001.
"Income Responses to Tax Changes--Evidence From the Norwegian Tax Reform,"
National Tax Journal, National Tax Association;National Tax Journal, vol. 54(2), pages 319-338, June.
- Thor O. Thoresen & Karl Ove Aarbu, 1999. "Income Responses to Tax Changes - Evidence from the Norwegian Tax Reform," Discussion Papers 260, Statistics Norway, Research Department.
- Musgrave, Richard A., 1990. "Horizontal Equity, Once More," National Tax Journal, National Tax Association;National Tax Journal, vol. 43(2), pages 113-122, June.
- Lambert, Peter J. & Millimet, Daniel L. & Slottje, Daniel, 2003. "Inequality aversion and the natural rate of subjective inequality," Journal of Public Economics, Elsevier, vol. 87(5-6), pages 1061-1090, May.
- Kakwani, Nanok C, 1977. "Measurement of Tax Progressivity: An International Comparison," Economic Journal, Royal Economic Society, vol. 87(345), pages 71-80, March.
- McCloskey, Donald N, 1985. "The Loss Function Has Been Mislaid: The Rhetoric of Significance Tests," American Economic Review, American Economic Association, vol. 75(2), pages 201-205, May.
- Cowell, F.A., 2000.
"Measurement of inequality,"
Handbook of Income Distribution, in: A.B. Atkinson & F. Bourguignon (ed.), Handbook of Income Distribution, edition 1, volume 1, chapter 2, pages 87-166,
Elsevier.
- Cowell, Frank, 1998. "Measurement of inequality," LSE Research Online Documents on Economics 2084, London School of Economics and Political Science, LSE Library.
- Valentino Dardanoni & Peter Lambert, 2001.
"Horizontal inequity comparisons,"
Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 18(4), pages 799-816.
- Valentino Dardanoni & Peter Lambert,, 1998. "Horizontal inequity comparisons," IFS Working Papers W98/07, Institute for Fiscal Studies.
- Charles Blackorby & David Donaldson, 1984. "Ethical Social Index Numbers and the Measurement of Effective Tax-Benefit Progressivity," Canadian Journal of Economics, Canadian Economics Association, vol. 17(4), pages 683-694, November.
- Atkinson, Anthony B., 1970. "On the measurement of inequality," Journal of Economic Theory, Elsevier, vol. 2(3), pages 244-263, September.
- Stephen Jenkins & Peter Lambert, "undated". "Horizontal Inequity Measurement: A Basic Reassessment," Discussion Papers 96/21, Department of Economics, University of York.
- Mervyn A. King, 1980. "An Index of Inequality: With Applications to Horizontal Equity and Social Mobility," NBER Working Papers 0468, National Bureau of Economic Research, Inc.
- Jean‐Yves Duclos & Peter J. Lambert, 2000. "A normative and statistical approach to measuring classical horizontal inequity," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 33(1), pages 87-113, February.
- Pfahler, Wilhelm, 1987. "Redistributive Effects of Tax Progressivity: Evaluating a General Class of Aggregate Measures," Public Finance = Finances publiques, , vol. 42(1), pages 1-31.
- Dardanoni, Valentino & Lambert, Peter J., 2002. "Progressivity comparisons," Journal of Public Economics, Elsevier, vol. 86(1), pages 99-122, October.
Citations
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Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 59(2), pages 235-249, June.
- John Creedy & Elin Halvorsen & Thor O. Thoresen, 2011. "Inequality Comparisons in a Multi-Period Framework: The Role of Alternative Welfare Metrics," Department of Economics - Working Papers Series 1127, The University of Melbourne.
- Creedy, John & Halvorsen, Elin & Thoresen, Thor, 2012. "Inequality Comparisons in a Multi-Period Framework: The Role of Alternative Welfare Metrics," Working Paper Series 18716, Victoria University of Wellington, Chair in Public Finance.
- Doorley, Karina & Callan, Tim & Savage, Michael, 2018.
"Inequality in EU crisis countries. How effective were automatic stabilisers?,"
EUROMOD Working Papers
EM10/18, EUROMOD at the Institute for Social and Economic Research.
- Callan, Tim & Doorley, Karina & Savage, Michael, 2018. "Inequality in EU Crisis Countries: How Effective Were Automatic Stabilisers?," IZA Discussion Papers 11439, Institute of Labor Economics (IZA).
- Bargain, Olivier B. & Dolls, Mathias & Immervoll, Herwig & Neumann, Dirk & Peichl, Andreas & Pestel, Nico & Siegloch, Sebastian, 2011.
"Tax Policy and Income Inequality in the U.S., 1978-2009: A Decomposition Approach,"
IZA Discussion Papers
5910, Institute of Labor Economics (IZA).
- Olivier Bargain & Mathias Dolls & Herwig Immervoll & Dirk Neumann & Andreas Peichl & Nico Pestel & Sebastian Siegloch, 2011. "Tax policy and income inequality in the U.S., 1978—2009: A decomposition approach," Working Papers 215, ECINEQ, Society for the Study of Economic Inequality.
- Peter J. Lambert & Runa Nesbakken & Thor O. Thoresen, 2012. "Is there more redistribution in Scandinavia than in the US?," Economics Bulletin, AccessEcon, vol. 32(3), pages 2146-2154.
- Bargain, Olivier B. & Dolls, Mathias & Immervoll, Herwig & Neumann, Dirk & Peichl, Andreas & Pestel, Nico & Siegloch, Sebastian, 2013. "Partisan Tax Policy and Income Inequality in the U.S., 1979-2007," IZA Discussion Papers 7190, Institute of Labor Economics (IZA).
- Ricardo Batista Politi & Enlinson Mattos, 2011.
"Ad‐valorem tax incidence and after‐tax price adjustments: evidence from Brazilian basic basket food,"
Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 44(4), pages 1438-1470, November.
- Ricardo Batista Politi & Enlinson Mattos, 2011. "Ad-valorem tax incidence and after-tax price adjustments: evidence from Brazilian basic basket food," Canadian Journal of Economics, Canadian Economics Association, vol. 44(4), pages 1438-1470, November.
- Annette Alstadsæter & Knut Reidar Wangen, 2008. "Corporations’ Choice of Tax Regime when Transition Costs are Small and Income Shifting Potential is Large," CESifo Working Paper Series 2392, CESifo.
- Olivier Bargain & Tim Callan & Karina Doorley & Claire Keane, 2017.
"Changes in Income Distributions and the Role of Tax‐Benefit Policy During the Great Recession: An International Perspective,"
Fiscal Studies, Institute for Fiscal Studies, vol. 38, pages 559-585, December.
- Doorley, Karina & Keane, Claire & Bargain, Olivier & Callan, Tim, 2013. "Changes in income distribution and the role of tax-benefit policy during the Great Recession: an international perspective," EUROMOD Working Papers EM21/13, EUROMOD at the Institute for Social and Economic Research.
- Bargain, Olivier & Callan, Tim & Doorley, Karina & Keane, Claire, 2014. "Changes in Income Distributions and the Role of Tax-benefit Policy During the Great Recession: An International Perspective," Papers WP474, Economic and Social Research Institute (ESRI).
- Olivier Bargain & Tim Callan & Karina Doorley & Claire Keane, 2017. "Changes in Income Distributions and the Role of Tax-Benefit Policy During the Great Recession: An International Perspective," Post-Print hal-03590136, HAL.
- Bargain, Olivier B. & Callan, Tim & Doorley, Karina & Keane, Claire, 2013. "Changes in Income Distributions and the Role of Tax-Benefit Policy During the Great Recession: An International Perspective," IZA Discussion Papers 7737, Institute of Labor Economics (IZA).
- Bargain, Olivier & Dolls, Mathias & Immervoll, Herwig & Neumann, Dirk & Peichl, Andreas & Pestel, Nico & Siegloch, Sebastian, 2014. "Tax policy and income inequality in the US, 1979-2007," ZEW Discussion Papers 14-001, ZEW - Leibniz Centre for European Economic Research.
- Lambert Peter J. & Thoresen Thor O., 2012.
"The Inequality Effects of a Dual Income Tax System,"
The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 12(1), pages 1-17, July.
- Peter J. Lambert & Thor O. Thoresen, 2011. "The inequality effects of a dual income tax system," Discussion Papers 663, Statistics Norway, Research Department.
- Peter Lambert & Thor Thoresen & Runa Nesbakken, 2010.
"On the Meaning and Measurement of Redistribution in Cross-Country Comparisons,"
LIS Working papers
532, LIS Cross-National Data Center in Luxembourg.
- Peter J. Lambert & Runa Nesbakken & Thor O. Thoresen, 2011. "On the meaning and measurement of redistribution in cross-country comparisons," Discussion Papers 649, Statistics Norway, Research Department.
- Thor O. Thoresen & Erlend E. Bø & Erik Fjærli & Elin Halvorsen, 2012.
"A Suggestion for Evaluating the Redistributional Effects of Tax Changes: With an Application to the 2006 Norwegian Tax Reform,"
Public Finance Review, , vol. 40(3), pages 303-338, May.
- Thor O. Thoresen & Erlend E. Bø & Erik Fjærli & Elin Halvorsen, 2011. "Evaluating the redistributional effects of tax policy changes: with an application to the 2006 Norwegian tax reform," Discussion Papers 648, Statistics Norway, Research Department.
- Karina Doorley & Tim Callan & Michael Savage, 2021. "What drove income inequality in EU crisis countries during the Great Recession?," Fiscal Studies, John Wiley & Sons, vol. 42(2), pages 319-343, June.
- Erlend Bø & Peter Lambert & Thor Thoresen, 2012.
"Horizontal inequity under a dual income tax system: principles and measurement,"
International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 19(5), pages 625-640, October.
- Erlend E. Bø & Peter J. Lambert & Thor O. Thoresen, 2011. "Horizontal inequity under a dual income tax system: principles and measurement," Discussion Papers 647, Statistics Norway, Research Department.
- Miyazaki, Takeshi & Kitamura, Yukinobu, 2014. "Redistributive Effects of Income Tax Rates and Tax Base 1984-2009: Evidence from Japanese Tax Reforms," Discussion Paper Series 610, Institute of Economic Research, Hitotsubashi University.
- Nicolas Herault & Francisco Azpitarte, 2014. "Recent Trends in Income Redistribution in Australia: Can Changes in the Tax-Transfer System Account for the Decline in Redistribution?," Melbourne Institute Working Paper Series wp2014n02, Melbourne Institute of Applied Economic and Social Research, The University of Melbourne.
- Olivier Bargain, 2009.
"The distributional effects of tax-benefit policies under New Labour : a Shapley decomposition,"
Working Papers
200907, School of Economics, University College Dublin.
- Olivier Bargain, 2009. "The Distributional Effects of Tax-benefit Policies under New Labour: A Shapley Decomposition," Working Papers 200918, Geary Institute, University College Dublin.
- Bargain, Olivier, 2009. "The distributional effects of tax-benefit policies under New Labour: a Shapley decomposition," EUROMOD Working Papers EM2/09, EUROMOD at the Institute for Social and Economic Research.
- Bargain, Olivier B., 2009. "The Distributional Effects of Tax-Benefit Policies under New Labour: A Shapley Decomposition," IZA Discussion Papers 4296, Institute of Labor Economics (IZA).
- Thor O. Thoresen & Zhiyang Jia & Peter J. Lambert, 2016. "Is there More Redistribution Now? A Review of Methods for Evaluating Tax Redistributional Effects," FinanzArchiv: Public Finance Analysis, Mohr Siebeck, Tübingen, vol. 72(3), pages 302-333, September.
- Peter J. Lambert & Runa Nesbakken & Thor O. Thoresen, 2020. "A Common Base Answer to the Question “Which Country Is Most Redistributive?”," Scandinavian Journal of Economics, Wiley Blackwell, vol. 122(4), pages 1467-1479, October.
- Olivier Bargain, 2012. "Decomposition analysis of distributive policies using behavioural simulations," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 19(5), pages 708-731, October.
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More about this item
Keywords
Income tax; Tax progressivity; Horizontal inequity;All these keywords.
JEL classification:
- D31 - Microeconomics - - Distribution - - - Personal Income and Wealth Distribution
- D63 - Microeconomics - - Welfare Economics - - - Equity, Justice, Inequality, and Other Normative Criteria and Measurement
- H24 - Public Economics - - Taxation, Subsidies, and Revenue - - - Personal Income and Other Nonbusiness Taxes and Subsidies
NEP fields
This paper has been announced in the following NEP Reports:- NEP-EEC-2005-10-15 (European Economics)
- NEP-PBE-2005-10-15 (Public Economics)
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