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Video by Fred Tschepp
References:
1) PR results in more egalitarian societies: Norris (1985); Matland (1998); Reynolds (1999); Kenworthy and Malami (1999); Siaroff (2000); Moser (2001); Salmond (2006); Lijphart (2012).
2) PR countries have lower economic inequality: Carey and Hix (2009); Lijphart (2012); OECD. (2017).
3) Proportional democracies take more effective action on climate and environment: Fredriksson and Millimet (2004); Cohen (2010); Orellana (2014).
4) First Past the Post is the single strongest predictor that a developed democracy will go to war: Leblang and Chan (2003). Also see Orellana (2014) regarding levels of military spending in PR and FPTP democracies.
See https://www.makevotesmatter.org.uk/la... for full citations.
Correction: please note that there was no 1969 election - apologies for the error (however the Representation of the People Act extended the vote to men and women over 18, which was pretty cool)