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Why Proportional Representation?
This document summarizes results from research comparing the performance of the two main families of voting systems: winner-take-all and proportional representation (PR). We already know that PR is a way of ensuring that all votes count and delivering more representative election results. The research cited below goes further, by demonstrating the impact of PR on the policy choices made by governments. This research shows that PR outperforms winner-take-all systems on measures of democracy, quality of life, income equality, environmental performance, and fiscal policy.
Comparing Winner-Take-All to Proportional Systems
Substantial comparative research has been conducted on the impact of winner-take-all systems vs proportional systems. This document covers a wide range of indicators because the choice of electoral systems has wide-ranging implications for how citizens relate to their governments and how government policies are considered and implemented.
Here are some of the main reasons we might expect a proportional system to have an impact:
- PR gives equal value to every vote and for this reason is likely to lead to increased government accountability to citizens and greater voter satisfaction. Some of the impacts of this can be seen below in the section titled Measures of Democracy.
- A shortcoming of winner-take-all systems is that small shifts in electoral preferences are sufficient to generate large shifts in power. Legislators can lose their seats at any time and power can easily shift from one majority government to another. The resulting political instability has significant implications:
- it leads to a high level of uncertainty;
- it encourages the hyper-partisanship observed in countries using such voting systems;
- it encourages politicians to focus on immediate political advantage at the expense of long-term issues; and
- it contributes to policy-lurch when one government replaces another.
The introduction of a proportional system does away with this amplification of small changes in voter preferences, leading to a greater level of political stability, less partisanship, a longer-term perspective and increased policy coherence over time.
- PR empowers ordinary citizens, by making every vote count and allowing for a wider range of views to be represented in the legislature. This can reduce inequality and improve access to social services over time, and, according to Salomon Orellana (2014, summarized here), could have a salutary effect on how a country deals with diversity more generally. Orellana argues that increased opportunities for diversity and dissent allow PR countries to outperform winner-take-all countries in four areas:
- policy innovation
- mitigating the pandering of politicians in the pursuit of voters by promising quick-fix solutions
- increasing the political sophistication of the electorate
- limiting elite control over decision making.
Types of Electoral Systems
The electoral system we currently use everywhere in Canada belongs to a family of electoral systems based on the election of one representative in each riding on a winner-take-all basis. This type of system is sometimes called “majoritarian,” but with several parties in the running, the winner is often elected with only a plurality of the vote (more votes than any other candidate). We thus prefer the expression “winner-take-all” to refer to electoral systems in which candidates are elected based on a plurality or majority of the vote. This includes most notably our own single-member plurality or first-past-the-post system, and systems like those used in France or Australia, which use run-off or instant runoff mechanisms to ensure that the winner enjoys majority support. Winner-take-all models tend to produce majority governments by a single party, whether that party achieves a majority of the vote or not.
By comparison, proportional systems are designed to ensure that the composition of the legislature reflects how citizens voted to the maximum extent possible. In between, are semi-proportional systems which fall someplace between the two, of the sort we have in Italy, Greece and Japan. The degree of proportionality to be observed can thus vary quite considerably from one country to the next.
Measures of Democracy
Arend Lijphart, a world-renowned political scientist, spent his career studying various features of democratic life in different countries. In his landmark study (2012), he compared 36 democracies over 55 years. Lijphart uses his own classification system, speaking of “majoritarian” and “consensual” democracies. We will call these “winner-take-all” and PR countries.
Using World Governance Indicators and Transparency International’s Corruption Perception Index, Lijphart found that PR countries outperformed winner-take-all ones on 16 out of 17 measures of sound government and decision making – nine of them at a statistically significant level – including government effectiveness (quality and independence of the public service, quality of policy making), rule of law, and the level and control of corruption (including capture of the state by elite interests).
Looking at a number of specific indicators, Lijphart concludes that consensual (PR) democracies are “kinder, gentler democracies.” Among his findings:
- Voter turnout was higher by 7.5 percentage points, when contextual factors are taken into account.
- Government policies were closer to the view of the median voter.
- Citizens were more satisfied with the performance of their countries’ democratic institutions,
even when the party they voted for was not in power.
- There was a small increase in the number of parties in Parliament.
- The share of women elected as legislators was 8 percentage points higher.
- Scores were higher on measures of political participation and civil liberties
Research by other authors has yielded similar results. Lijphart’s finding that proportional systems lead to governments that better reflect the views of the median voter was confirmed by McDonald, Mendes and Budge (2004), who looked at 254 elections in 20 countries. Blais and Loewen (2007) found that citizens in countries with PR felt their elections were fairer and that elected officials were more responsive to the electorate.
Blais, Morin-chassé and Singh (2017) found that citizens are “sensitive to deficits in representation” and that satisfaction with democracy is lower when the party one voted for does not get seats in proportion to the popular vote. Recent experimental work by Plescia, Blais and Högström (2020) showed a drop in support for voting rules in Austria, England, Ireland and Sweden when results were disproportional. This held for voters supporting larger parties as well as small parties. The authors observe that large-party voters also want a fair system, even if disproportionality advantages their party.
Looking at the impact of PR on voler turnout, Pilon (2007) is cautious about jumping to conclusions. He notes that the observed impact varies from study to study and draws attention to other considerations than the choice of electoral system. However, he ends up supporting Lijphart’s conclusion, describing the “typical bonus” of voter turnout under PR to be in the order of seven to eight percentage points.
Research by the International Institute for Democracy and Electoral Assistance examining youth participation in elections in 15 countries suggests that the boost in turnout in proportional systems may be as much as 12 percentage points higher for youth (85.8% in the presence of high proportionality vs. 73.9% in its absence) (IDEA 1999: 30). PR also affects the ability of younger people to be elected as legislators. Using data from 128 countries, the Inter-Parliamentary Union (2016: 7) found that youth representation in legislatures was 15-20 times higher with proportional systems compared to majoritarian systems.
Proportional representation may also be associated with higher levels of political knowledge among citizens. Gordon and Segura (1997) conclude that:
Seats-votes disparities are a disincentive to interest in politics since accumulated preferences are not directly reflected in the composition of representative institutions.
Milner (2014) adds that parties under proportional systems are more consistent over time, making it easier for citizens to decide which party or parties best reflect their political preferences. He argues that parties tend to change their platforms and leaders more often under first-past-the-post in an attempt to generate minor shifts in short-term voter preferences that can translate into much larger shifts in the number of seats won. Since PR systems do not inflate the effect of shifting voter preferences in the same way, parties under PR prefer to build up adherents over the long term rather than shifting their policies and leaders in response to short-term opportunities.
PR systems thus provide voters with a relatively clear and stable “political map” over time. “In this way,” Milner summarizes, “PR fosters political knowledge and thus,potentially, electoral participation, especially at the lower end of the education ladders, where information about issues and actors is at a premium.”
The choice of electoral system also affects how politicians behave. Nemoto and Pinto (2019) studied the nature of political discourse in the New Zealand Parliament before and after PR was adopted in 1996. Analyzing 821,442 parliamentary speeches by MPs from 1987 to 2016, they found a marked decrease in the anger and hostility in MP’s speeches overall after 1996, most significantly in the tone of ruling party MPs towards smaller parties who might one day be coalition partners with them.
Lehoucq and Kolev (2015) looked at occurrences of electoral fraud. They used two complementary approaches. First, they focused on a database of 1300 accusations of fraud covering 175 elections in Costa Rica between 1901 and 1948. During this period, less populated districts (provinces) used plurality while more populated ones used PR. They found that first-past-the-post led to more fraud than proportional systems. They then validated this result using the Quality of Elections Database. Looking at data covering 170 countries between 1975 and 2004, they demonstrate that first-past-the-post is associated with lower quality of elections.
The authors explain that the winner-take-all aspect of plurality systems encourages electoral fraud, pointing out that, “In FPTP systems, candidates face more incentives to prevent opposition voters from casting ballots, to tamper with voter rolls and even the ballot box, and to manipulate the tally of the vote. Winning, by even one (questionable) vote, is preferable to being shut out of parliamentary representation.”
Women in Politics
The tendency of PR countries to elect more women compared to winner-take-all countries is well established in the comparative literature (Rosen, 2011: 209). The theory is that multi-member districts allow more women to be elected because parties will want to put forward a diversified slate of candidates to reach a wider range of voters. It is much easier for a party to ensure balanced representation with multi-member districts than in single-member districts.
Looking at 168 countries from 1992 to 2010, Jennifer Rosen found that developed countries with PR elected more women by a margin of about 10 percentage points compared to majoritarian countries — a bit more in countries with closed list PR, a bit less in countries with open lists. Countries with mixed systems outperformed majoritarian countries by 6 points. Contrary to expectations, she finds that quotas do not have a significant impact in developed countries. She gets different results for developing countries where she finds a considerably smaller PR bonus and a much larger effect attributable to the use of quotas (Rosen, 2011: 314, model 2 coefficients).
Australia provides the perfect petri dish for comparing different electoral systems, because the two Australian houses of parliament use different systems: an STV-based PR system for the Senate and a winner-take-all system using ranked ballots (AV) for the House or Representatives. Kaminsky and White (2007) looked at elections in both chambers over a 61 year period and found that more than two and a half times more women were elected to the Senate than the House of Representatives.
After women were given the right to run for Parliament in 1902, the share of women representatives grew more quickly in the Senate than in the House and has averaged 10-15 points higher in recent years. As of 2019, the share of women was 51% in the Senate as against 31% in the House of Representatives (International Parliamentary Union, 2021). The Australian states of Tasmania and the Australian Capital territory — the only ones to also use STV PR — have also elected relatively large proportions of women to their legislatures in recent years (BBC, 2018 and Burch, 2018, Appendix A).
Women in winner-take-all countries like Canada, the US and the UK currently make up about 30% women in Parliament in comparison to PR countries such as New Zealand, Sweden, Spain and Switzerland which have recently elected from 42% to 48% women (Inter-Parliamentary Union, 2021).
One of the biggest debates about PR is whether it leads to political and policy instability. This section looks at two facets of this question:
- the frequency of elections, and
- the issue of policy lurch
As we shall see, the evidence strongly favours PR over winner-take-all systems.
Frequency of elections
Regarding the frequency of elections, the comparative research shows little difference between PR and FPTP countries. Looking at elections from 1945 to 1998, Pilon (2007: 150) points out that countries using FPTP averaged 16.7 elections, while countries using proportional systems averaged only 16.0 elections. The difference between these two groups of countries is negligible.
Pilon points to other data that shows a somewhat shorter government life-span in PR countries (1.8 years as opposed to 2.5 years in FPTP countries), but discounts this result because it is heavily influenced by Italian experience mainly involving what would elsewhere only be considered as cabinet shuffles (2007: 147). He concludes that this type of instability is “not a problem for PR systems in western countries” (2007: 151).
However, there are other ways to assess the link between electoral systems and stability. Countries with winner-take-all systems that tend to oscillate from left to right, are characterized by policy shifts largely unrelated to underlying voter preferences, and cannot be said to satisfy the test of stability terribly well. Indeed, it is not unusual for one government to simply undo what the previous government has done, in a process of “policy lurch” in winner-take-all systems such as Australia, the US, the UK and Canada.
In New Zealand, dramatic policy shifts enacted by the National and Labour governments in the 1970s and 1980s were one of the main reasons for voter disaffection with the first-past-the-post system prior to the introduction of MMP in 1996. Although the government has continued to be dominated by the National and Labour parties at different moments since then, the need of the government to secure the support of other parties to enact legislation and the stronger voice of smaller parties in the House are felt to have considerably tempered the policy lurch phenomenon (Shaw 2016).
In Canada, we need look no further than the efforts by the Harper government to undo much of the Liberal government legacy that they inherited and the subsequent undoing of conservative policies by the Liberal government following the 2015 election.
After the Liberal Government came to power in 2015, they published a list of budget cuts enacted by the previous government, many of which were aimed at programs established by previous Liberal governments.
This included cuts to:
- Aboriginal Affairs and Northern Development,
- the Environment Portfolio,
- Fisheries and Oceans,
- Parks Canada Agency,
- Citizenship and Immigration,
- the Canadian Food Inspection Agency,
- the Canadian Heritage Portfolio,
- Library and Archives Canada,
- the National Arts Centre, and
- the National Film Board of Canada.
The Liberal Government elected in 2015 then spent much of its first year in office undoing these cuts, including the following measures (Various media reports, 2015/2016):
- restored the long-form census;
- pledged to reverse funding cuts to the CBC;
- overturned the closing of veterans offices;
- overturned two pieces of legislation it considered punitive to labour;
- restored funding to First Nations which had been frozen under the previous government’s transparency act;
- planning to boost Parks Canada to counter Tory budget cuts;
- reopened coast guard stations;
- reopened funding for women’s groups;
- restored refugee health benefits cut by the previous government…
Policy lurch is a normal feature of our electoral system because small shifts in the political winds lead to significant shifts in power, as the country goes from a majority government at one pole of the spectrum to another.
Public Policy in Support of the Public Interest
However, policy lurch is but one of many ways that the electoral system can impact on public policy. In a recent article, Filippetti and Vezzani (2022) ask just that question: what institutional conditions are required to ensure that public policy speaks to the general public interest as opposed to special interests and addresses a time frame longer than the typical election cycle?
There are several reasons to believe that winner-take-all systems would deviate from these two ideals. The most important is likely to be the extreme sensitivity of the system to small shifts in voter preferences, encouraging politicians and parties to cater to targeted minorities of the voting public, by focusing on “wedge issues,” swing voters and swing ridings.
Once a government is formed by a single party, a winner-take-all system makes it easier for lobbyists to win special consideration, due to the concentration of government power that results. This stands in contrast to the sort of “consensus-based” governance systems identified by Lijphart (2012) in which every vote counts and politicians have to work together in making policy.
We explore three areas of public policy in what follows:
- Funding for public research,
- Fiscal and economic policy, and
- Environmental stewardship.
Investment in public research
Filippetti and Vezzani (2022) look closely at public funding for public research, the considerable benefits of which are widely recognized in policy circles — something that has become more obvious than ever in the health sphere as the world struggles with the COVID pandemic.
Funding for public research is a perfect example of a policy sphere that speaks to the general public interest while requiring a long-term policy perspective.
Using a comparative approach and a panel data set of 1,228 observations, the authors obtained robust and highly significant results under the following conditions (Table 3):
- systems of proportional representation;
- parliamentary, as opposed to presidential systems;
- bicameral legislatures; and
- the presence of encompassing civil society organisations.
The logic in each case is that these features encourage greater emphasis on the public good, providing a better institutional environment in support of science-based decision-making and innovation.
Canada could be said to satisfy the last three of these conditions either fully or fairly well. The major gap in Canada’s case is the lack of proportional representation.
Economic Performance and Fiscal Responsibility
Results of this sort can be found across the policy space. When considering the economic performance of countries using different systems, Carey and Hix (2009 and 2011) found that countries with moderately proportional systems were more fiscally responsible and more likely to enjoy fiscal surpluses. Orellana (2014) has found that proportional systems tend to have higher surpluses or lower deficits than less proportional systems, and lower levels of national debt. Orellana’s regression analysis predicts a surplus of 0.05 percent of GDP for fully proportional countries, against a deficit of 2.9 percent of GDP in winner-take-all countries. The projected national debt is 65.7 percent higher in winner-take-all countries than in those with fully proportional systems, meaning the cost of servicing the debt will be higher.
Turning to the issue of economic performance more generally, the correlation seems to depend upon the sample being used. Lijphart and Orellana found no relationship between electoral systems and economic growth. However, when Knutsen (2011) looked at a much longer historical period involving 3,710 country-years of data covering 107 countries from 1820 to 2002, he found that proportional and semi-proportional systems produced an “astonishingly robust” and “quite substantial” increase in economic growth – a one percentage point increase – compared to winner-take-all systems. Knutsen suggests that this may be because PR tends to promote broad-interest policies rather than special interest policies; and because PR systems produce more stable and thus more credible economic policies. He concludes that PR and semi-PR systems generate more prosperity than winner-take-all systems.
Knutsen’s empirical results are corroborated by more recent work by Alfano and Baraldi (2015) who studied 91 countries from 1979–2010. The particularity of Alfano and Baraldi’s work is that it considers the degree of proportionality of electoral results using the Gallagher Index (GI) as an indicator. Highly proportional countries like Sweden and Germany have a GI between 1 and 3. Canada typically has a GI of about 12. According to Alfano and Baraldi’s results, a country with a GI of 2.3 could expect an annual growth rate one percentage point higher than a country with a GI of 14. A one percentage point difference is also what Knutsen found.
Alfano and Baraldi find a non-linear relationship between proportionality and rates of growth. The relationship appears as a curve with the growth rate reaching its maximum value under a GI of around 6.5 matching the level of proportionality that we would expect to achieve in any of the made-in-Canada systems being proposed for this country. The predicted growth rate drops sharply for a Gallagher index above 14.
What emerges from this body of research is that proportional systems categorically and strongly outperform non-proportional systems in terms of economic growth. It seems that even a modest increase in proportionality is helpful. In Knutsen’s work, semi-PR and PR countries seem to achieve much the same result in terms of growth rates.
Opponents of proportional representation sometimes suggest that making votes count is “bad for business” because businesses will be overtaxed and investors will flee. However, the average corporate tax rate in PR countries was actually lower in 2017, according to figures from the OECD: 22.9% for PR countries vs. 27.2% for winner-take-all countries.
Looking at trade protection, which economists usually decry as being bad for the economy, in a study of 147 countries over 23 years, Evans (2009) found that winner-take-all systems have higher tariffs than proportional systems.
Taken together, these research results suggest that transitioning to a proportional voting system would be good for Canada’s economy. Nine out of ten of the wealthiest OECD countries are countries with proportional voting systems.
Frederiksson and Millimet (2004) found that countries with proportional systems set stricter environmental policies. Cohen (2010) found that countries with proportional systems were faster to ratify the Kyoto protocol, and that their share of world total carbon emissions had declined.
Lijphart (2012) found that countries with proportional systems scored six points higher on the Yale Environmental Performance Index, which measures ten policy areas, including environmental health, air quality, resource management, biodiversity and habitat, forestry, fisheries, agriculture and climate change.
Using data from the International Energy Agency, Orellana (2014) found that between 1990 and 2007, when carbon emissions were rising everywhere, the statistically predicted increase was significantly lower in countries with fully proportional systems, at 9.5%, compared to 45.5% in countries using winner-take-all systems.
Orellana also found that citizens in countries with proportional representation were more supportive of environmental action, and more willing to pay the costs associated with environmental protection. He found the use of renewable energy to be approximately 117 percent higher in countries with fully proportional electoral systems.
In sum, countries with proportional systems tend to act more quickly and do more to protect the environment.
As noted earlier, PR tends to empower ordinary citizens and one might expect that to be reflected in indicators of income inequality and of social policy outcomes. This expectation is also borne out in comparative research.
Lijphart (2012: 282) found that countries with proportional systems had considerably lower levels of income inequality.
Likewise, Birchfield and Crepaz (1998:192) found that “consensual political institutions [which use PR] tend to reduce income inequalities whereas majoritarian institutions have the opposite effect.” The results of the regression work they present were highly significant, with PR accounting for 51% of the variance in income inequality across countries. Birchfield and Crepaz explain this result in terms of the higher degree of political power of people in PR systems. In their words (1998:191):
The more widespread the access to political institutions, and the more representative the political system, the more citizens will take part in the political process to change it in their favour which will manifest itself, among other things, in lower income inequality. Such consensual political institutions make the government more responsive to the demands of a wider range of citizens.
Vincenzo Verardi, in a study of 28 democracies (2005), also found that when proportionality increases, inequality decreases. Iversen and Soskice (2006) found that PR is associated with greater efforts to promote income redistribution.
Bernauer, Giger and Rosset (2015) looking at 24 Parliamentary democracies, found that the political preferences of low income citizens are better represented in a more proportional system, and the political preferences of the rich are better represented in a winner-take-all system.
Investigating the broader impact of PR on society, Carey and Hix (2009 and 2011) looked at 610 elections over 60 years in 81 countries and found that PR countries garnered higher scores on the United Nations Index of Human Development, which incorporates health, education and standard of living indicators. Carey and Hix consider that the Index of Human Development provides “a reasonable overall indicator of government performance in the delivery of public goods and human welfare.” Lijphart found that countries with PR spent an average of 4.75% more on social expenditures than winner-take-all democracies.
Similarly, Altman, Flavin and Radcliff (2017) found robust evidence from 21 OECD countries that citizens in countries with proportional representation reported higher levels of life satisfaction, concluding that the real-world consequences for human well-being of PR and other features of democratic rule are substantial compared to other common predictors.
Patterson (2017) studied the experience of 179 countries with different types of democratic or autocratic regimes between 1975 and 2012 and found that countries with proportional systems most reliably outperformed other countries with regard to population health. Compared to “closed autocracies” at the other end of the spectrum, countries with PR had up to 12 more years of life expectancy on average, 75% less infant mortality, and lower mortality rates for most other age groups. In contrast, countries with winner-take-all systems were not better than closed autocracies in terms of health improvements over time. The authors conclude that democracies are not equally effective at holding leaders accountable and that broad representation of diverse interests appears to be what matters most to ensure positive health outcomes.
Christina Gathmann (2019) exploits a unique time-series database from Switzerland, where, between 1890 and 1950, eighteen of the country’s twenty-five cantons switched to proportional representation in a staggered way. She was thus able to exploit a data set of multiple before and after scenarios against which to assess the impact of changing over from a plurality to a proportional system.
She documents a “sizable shift in political participation and representation when cantons switched from a majoritarian to a proportional system… (that) gave the previously underrepresented working class a greater weight in the political process.” This led to changes in public spending, most significantly in the education sector, with ultimate benefits in terms of population health. She estimates that the electoral reform contributed between 11 and 17 percent to the observed decline in mortality during this period.
This is a sizable contribution considering the role of other factors, including major advances in sanitation and medical practices during this period. As she points out, “such sizable mortality reductions demonstrate that electoral rules and hence, the form of democratic representation have powerful consequences for population well-being.”
Management of the COVID-19 pandemic
Michael J Rigby et al. (October, 2021) have studied how well 42 OECD or European Union countries managed the COVID-19 pandemic in the critical period between May 2020 and Nov. 2020.
Trying to explain the differences in COVID impacts across countries, they found that neither the health system, nor measures of social and economic inequality helped to explain these differences. What they did find was a clear linkage between successful management of the pandemic and political features including the presence of a coalition government, having a female prime minister and a proportional voting system.
These features were particularly evident among the countries who showed the lowest increase in COVID death rates per million people from May to November 2020. Among the top six, five had coalition governments, four had female PMs, and all six were PR countries. Among the top 14 performers, 12 had coalition or minority governments, including Canada. Similar results were obtained using the “resilience index” as an indicator (Table 6).
The authors argue that “coalition governments, by being more fragile and needing to keep political partners continuously convinced and thus committed, also have to be persuasive… Conversely, countries with first past the post elections can result in governments representing only a minority of the population, and single party majority governments can ride out criticism with comparative impunity over several years until the next election” (p. 21). They cite the US and the UK as examples where populist-style majoritarian governments have led to comparatively high mortality rates. They conclude that the way a government was led, and whether leaders based their decisions on scientific evidence and shared the reasoning with citizens, had notable effects (p. 2).
In their view, “majority governments, seeming strong but being more impervious to feedback, appear less effective in pandemic management” compared to coalition governments elected under proportional systems (p. 23).
Diversity and Social Cohesion
Electoral systems can affect how citizens and government interact and how citizens relate to each other. As we saw in the introduction, Orellana provides a number of reasons why the diversity of views in PR systems can have an impact. Here are some of the repercussions of adopting more proportional electoral systems.
Prejudice, Tolerance and Changing Attitudes
Using data from the World Values Survey conducted between 1981 and 2010, Orellana found that citizens in countries with proportional systems tend to show less prejudice towards minority and marginalized groups. Countries with winner-take-all systems scored approximately 44 percent higher on the prejudice scale than countries with fully proportional electoral systems.
He found that citizens in countries with more proportional electoral systems tend to have higher levels of tolerance for homosexuality, abortion, divorce, euthanasia and prostitution; and a higher level of disagreement with the notion that men make better leaders.
Furthermore, their attitudes towards those issues tended to evolve more quickly than elsewhere. Over a roughly 25-year period, the share of the population demonstrating tolerance of homosexuality increased by 41 percentage points in countries using proportional systems but only 20 percentage points in single member district systems.
Law Enforcement and National Defence
Perhaps because PR mitigates pandering for votes based on quick fixes, both Lijphart and Orellana found that countries with less proportional systems tend to have more public support for punitive solutions to crime, and produce more punitive policy outcomes including higher incarceration rates and greater use of capital punishment. Orellana found that support for incarceration is approximately 28 percentage points higher in countries with winner-take-all systems. Confirming similar results by Lijphart, he found that the statistically-predicted incarceration rate for countries with fully proportional systems was 136 per 100,000 people compared to 246 per 100,000 in winner-take-all countries.
Relying on an indicator of privacy and surveillance produced by Privacy International for over 30 countries, Orellana found that countries with proportional systems scored 58% higher on the privacy index.
Looking at the average military expenditure as a percentage of GDP between 1988 and 2012 and data from the Stockholm International Peace Research Institute, Orellana found that the predicted level of military spending for countries with winner-take-all systems was more than twice as high as for countries with fully proportional systems (2.6% vs. 1.1% of GDP).
Leblang and Chan (2003) found that a country’s electoral system is the most important predictor of a country’s involvement in war, according to three different measures: (1) when a country was the first to enter a war; (2) when it joined a multinational coalition in an ongoing war; and (3) how long it stayed in a war after becoming a party to it.
Lijphart found that PR is strongly correlated with a lower degree of violent events, more political stability and a lower risk of internal conflict. Qvortrup and Lijphart (2013), looking at the same 36 countries studied in Lijphart’s earlier work, found “statistically significant correlations between the index of consensus democracy and a higher incidence of fatal domestic terror incidents in the period 1985–2010.” They also found that the risk of fatal terrorist attacks was almost six times higher in winner-take-all democracies.
Is perfect proportionality needed to have an impact?
One might wonder how perfectly proportional an electoral system has to be before its impact is felt. This is relevant to Canada, which is considering MMP and other regionally-based options that are highly, but not fully, proportional.
The issue was the primary research question covered by Carey and Hix. Their results show that moderately proportional systems involving multi-member districts of six to eight seats made it possible to avoid disproportional results to a degree almost matching that of more purely proportional systems (2011: Figure 3). They point to countries such as Costa Rica, Hungary, Ireland, Portugal, and Spain that have settled for a moderate degree of proportionality in the design of their electoral systems.
In conclusion, the existing body of comparative research internationally leaves little room for doubt that PR is the better choice.
PR outperforms winner-take-all systems in almost every respect:
- higher quality of democratic life,
- prudent fiscal management,
- higher economic growth,
- better environmental management,
- reduced income inequality,
- higher levels of human development,
- greater tolerance of diversity,
- a less punitive approach to law enforcement,
- greater respect for privacy, and
- lower levels of conflict and militarism.
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