The unequal treatment of voters under a single transferable vote

Borooah, Vani (2007): The unequal treatment of voters under a single transferable vote. Published in: Public Choice and the Challenges of Democracy (2007): pp. 235-254.

Abstract

The method of Single Transferable Voting (STV) underpins electionsin several countries. The advantages claimed for STV are that, firstly, it allows each voter to express his/her preferences over all the candidates and, secondly, it takes account of each voter’s range of preferences in determing the electoral outcome. A disquieting feature of STV - and one that has hardly been commented upon - is that the second point is not true: some voters have more than just their first preference taken account of; for other voters, it is only their first preference votes which are counted, their remaining preferences being ignored. This creates two classes of voters - termed in this paper as ‘further-preference’ and ‘first-preference only’ voters. Applying these concepts to the (STV based) Northern Ireland Assembly elections of 2003, this paper shows that over half of all voters were ‘first-preference only’ voters. Moreover, the different parties had different endowments of voters from these groups: in particular, the Unionist parties had a disproprtionately larger share of ‘further-preference’ voters compared to the Nationalist parties. This might go some way to explaining why, even though the vote share of the Democratic Unionist Party was only slightly higher - and the vote share of the Ulster Unionist Party was actually lower - than that of Sinn Féin, both parties had disproportionately more seats in the Assembly. The paper proceeds to argue that, if society is averse to inter-voter inequality, it might prefer a voting method which treated all voters equally - even though it allowed them a more limited expression of preferences over candidates - to the STV method.

• Item Type: MPRA Paper
• Language: English
• Keywords: Elections, Single Transferable Vote, Inequality
• Subjects: P - Economic Systems > P1 - Capitalist Systems > P16 - Political Economy

References

Amy, D.J. (1993), Real Chioces/New Choices, New York: Columbia University Press.

Atkinson, A.B. (1970), “On the Measurement of Inequality”, Journal of Economic Theory 2, 244-63.

Bogdanor, V. (2001), Devolution in the United Kingdom (Oxford University Press: Oxford).

Bowles, S. and Grofman. B. (2000), “Introduction: STV as an Embedded Institution”, in S. Bowles and B. Grofman (2000), Elections in Australia, Ireland and Malta under the Single Transferable Vote, Ann Arbor: University of Michigan Press.

Gallagher, M. (1991), “Proportionality, Disproportionality and Electoral Systems”, Electoral Studies 10, 33-51.

Hallett, G.H. (1984), “Proportional Respresentation with the Single Transferable Vote”, in A. Lijphart and B. Grofman (eds.), Choosing an Electoral System: Issues and Alternatives, New York: Preager, 113-125.

Katz, R.S., (1984), “The Single Transferable Vote and Proportional Representation”, in in A. Lijphart and B. Grofman (eds.), Choosing an Electoral System: Issues and Alternatives, New York: Preager, 135-145.

Sen, A.K. (1973), On Income Inequality (Oxford University Press: Oxford).

Sinnott, R.(1993), The Electoral System, in J. Coakley, J. and M. Gallagher (1993), Politics in the Republic of Ireland Dublin: PSAI Press, 67-85.