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Information Acquisition, Ideology and Turnout: Theory and Evidence From Britain

Government Department of the London School of Economics, V.Larcinese{at}lse.ac.uk, Suntory and Toyota International Centres for Economics and Related Disciplines

The amount of political information that voters decide to acquire during an electoral campaign depends, among other things, on prior ideological beliefs about parties and/or candidates. Voters that are ex ante indifferent about the candidates attach little value to information because they perceive that voting itself will have little value. Voters that are ex ante very ideological also attach little value to information because they think that the news will hardly change their opinion. Thus, high incentives to be informed can be found at intermediate levels of partisanship. Moreover, the impact of increased political knowledge on turnout is asymmetric: new information increases the probability of voting of indifferent voters but decreases that of very ideological voters. These results are derived within a decision theoretical model of information acquisition and turnout that combines the Riker—Ordeshook (1968) approach to voting behaviour with the Becker (1965) approach to personal production functions. These predictions are then tested on survey data from the 1997 British Election Study (Heath et al., 1999). Our empirical findings are compatible with all the results of the theoretical exercise.

Key Words: elections • ideology • information • mass media • partisanship • political knowledge • political participation • turnout

Journal of Theoretical Politics, Vol. 21, No. 2, 237-276 (2009)
DOI: 10.1177/0951629808100765


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