The poor have a greater propensity to support right-wing parties in countries that are ethnically heterogeneous, rich, low in urbanization, low in party-system polarization, and that have no parties that are at once left wing on redistribution and right wing on issues related to individual liberty. . . . Income-based voting polarization increases when countries are ethnically homogenous and urbanized, when voters can choose to vote for a left-wing redistributive party that is conservative on individual liberty issues, and when there is no religious tax.
Sweden and Norway are included in the sample of data used for the analysis but unfortunately Denmark (where many blue-collar voters vote for the Liberals and the Danish People’s Party) isn’t. My immediate guess is that Denmark and Norway have a lower degree of party-system polarization than Sweden which could help explain the success of right-wing parties in attracting working-class voters. Go test.