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Democracy and polarization in the National Assembly of the Republic of Korea

  • Original Paper - Cross-Disciplinary Physics and Related Areas of Science and Technology
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Abstract

The median-voter hypothesis predicts convergence of party platforms across a one-dimensional political spectrum during majoritarian elections. Assuming that the convergence is reflected in legislative activity, we study the time evolution of political polarization in the National Assembly of the Republic of Korea for the past 70 years. By projecting the correlation of lawmakers onto the first principal axis, we observe a high degree of polarization from the early 1960s to the late 1980s before democratization. As predicted by the hypothesis, it showed a sharp decrease when party politics were revived in 1987. Since then, the political landscape has become more and more multi-dimensional under the action of party politics, which invalidates the assumption behind the hypothesis. For comparison, we also analyze co-sponsorship in the United States House of Representatives from 1979 to 2020, whose correlation matrix has been constantly high-dimensional throughout the observation period. Our analysis suggests a pattern of polarization evolving with democratic development, from which we can argue the power and the limitation of the median-voter hypothesis as an explanation of real politics.

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References

  1. E.E. Schattschneider, The Semisovereign people: a realist’s view of democracy in America (Wadsworth Publishing Company, Boston, 1975)

    Google Scholar 

  2. D. Adamany, Am. Political Sci. Rev. 66, 1321 (1972)

    Article  Google Scholar 

  3. G.C. Layman, T.M. Carsey, J.M. Horowitz, Annu. Rev. Polit. Sci. 9, 83 (2006)

    Article  Google Scholar 

  4. J.E. Campbell, Polarized: Making Sense of a Divided America (Princeton University Press, Princeton, 2018)

    Book  Google Scholar 

  5. A. Downs, An Economic Theory of Democracy (Harper & Row, New York, 1957)

    Google Scholar 

  6. R.G. Holcombe, Public Choice 61, 115 (1989)

    Article  Google Scholar 

  7. J.L. Barr, O.A. Davis, South. Econ. J. 33, 149 (1966)

    Article  Google Scholar 

  8. E.J. Mathis, C.E. Zech, Am. J. Econ. Sociol. 45, 403 (1986)

    Article  Google Scholar 

  9. G.K. Turnbull, S.S. Djoundourian, Public Choice 81, 223 (1994)

    Article  Google Scholar 

  10. B. Milanovic, Eur. J. Political Econ. 16, 367 (2000)

    Article  Google Scholar 

  11. H. Kasper, Public Choice 10, 1 (1971)

    Article  Google Scholar 

  12. W.A. McEachern, Natl. Tax J. 31, 129 (1978)

    Article  Google Scholar 

  13. T. Romer, H. Rosenthal, J. Public Econ. 12, 143 (1979)

    Article  Google Scholar 

  14. G.A. Boyne, Public Choice 53, 201 (1987)

    Article  Google Scholar 

  15. D.C. Mueller, Public Choice III (Cambridge University Press, New York, 2003)

    Book  Google Scholar 

  16. N. Canen, M.O. Jackson, F. Trebbi, Endogenous Networks and Legislative Activity (2021). https://doi.org/10.2139/ssrn.2823338

    Article  Google Scholar 

  17. L. Harbridge, Is Bipartisanship Dead?: Policy Agreement and Agenda-Setting in the House of Representatives (Cambridge University Press, New York, 2015)

    Book  Google Scholar 

  18. J.M. Curry, F.E. Lee, Perspect. Politics 17, 47 (2019)

    Article  Google Scholar 

  19. C. Park, W. Jang, Korean J. Appl. Stat. 30, 403 (2017)

    Article  Google Scholar 

  20. S.K. Baek, J. Kim, S.S. Lee, W.S. Jo, B.J. Kim, Physica A 560, 125178 (2020)

    Article  Google Scholar 

  21. N. McCarty, Polarization: What Everyone Needs to Know® (Oxford University Press, New York, 2019)

    Book  Google Scholar 

  22. J.B. Freeman, R. Dale, Behav. Res. Methods 45, 83 (2013)

    Article  Google Scholar 

  23. R. Pfister, K.A. Schwarz, M. Janczyk, R. Dale, J. Freeman, Front. Psychol. 4, 700 (2013)

    Google Scholar 

  24. I.T. Jolliffe, Principal Component Analysis (Springer, 1986), pp. 93–94

    Book  Google Scholar 

  25. M.E. Wall, L. Rocha, A. Rechtsteiner, Singular value decomposition and principal component analysis, in A Practical Approach to Microarray Data Analysis. ed. by D.P. Berrar, W. Dubitzky, M. Granzow (Springer, Cham, 2002), pp. 91–109

    Google Scholar 

  26. R.A. Serway, J.W. Jewett Jr., Physics for Scientists and Engineers with Modern Physics (Brooks/Cole, Boston, 2014), p. 10

    Google Scholar 

  27. J.H. Fowler, Polit. Anal. 14, 456 (2006)

    Article  Google Scholar 

  28. M.A. Porter, P.J. Mucha, M.E. Newman, A.J. Friend, Physica A 386, 414 (2007)

    Article  ADS  Google Scholar 

  29. Y. Zhang, A.J. Friend, A.L. Traud, M.A. Porter, J.H. Fowler, P.J. Mucha, Physica A 387, 1705 (2008)

    Article  ADS  Google Scholar 

  30. B.M. Harward, K.W. Moffett, Legis. Stud. Q. 35, 117 (2010)

    Article  Google Scholar 

  31. K.T. Macon, P.J. Mucha, M.A. Porter, Physica A 391, 343 (2012)

    Article  ADS  Google Scholar 

  32. M.P. Rombach, M.A. Porter, J.H. Fowler, P.J. Mucha, SIAM J. Appl. Math. 74, 167 (2014)

    Article  MathSciNet  Google Scholar 

  33. C. Andris, D. Lee, M.J. Hamilton, M. Martino, C.E. Gunning, J.A. Selden, PLOS ONE 10, e0123507 (2015)

    Article  Google Scholar 

  34. T. Colliri, L. Zhao, Sci. Rep. 9, 1 (2019)

    Article  Google Scholar 

Download references

Acknowledgements

This work was supported by a research grant of Pukyong National University (2020).

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Authors and Affiliations

  1. Department of Physics, Pukyong National University, Busan, 48513, Korea

    Jonghoon Kim & Seung Ki Baek

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  1. Jonghoon Kim
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  2. Seung Ki Baek
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Correspondence to Seung Ki Baek.

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Kim, J., Baek, S.K. Democracy and polarization in the National Assembly of the Republic of Korea. J. Korean Phys. Soc. 80, 509–515 (2022). https://doi.org/10.1007/s40042-022-00400-6

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  • DOI: https://doi.org/10.1007/s40042-022-00400-6

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