Pre-electoral coalitions increase voter turnout by making elections more decisive

The UK continues to use the First Past the Post electoral system, which is more likely to result in majority governments, but less representative of voter preferences as expressed through the ballot box. It has been argued that not only are proportional systems fairer than majoritarian ones, but that they can increase turnout through making votes more consequential. Here Erik R. Tillman argues that pre-electoral coalitions can also increase turnout by providing voters with a decisive outcome.