Acknowledgements: I am very grateful to Tim Besley for helpful discussions during all stages of this project and for comments and suggestions on a number of previous versions of this paper. I also wish to thank Oriana Bandiera, Richard Blundell, Harold Clarke, Keith Dowding, Guillaume Frechette, Cesar Martinelli, Maria Pia Monteduro, Imran Rasul, Leo Rizzo, Cristiana Vitale and Donald Wittman as well as participants in a number of meetings and seminars for their useful comments and suggestions. I remain the sole responsible for limits and errors of this work. Financial support from the European Commission under the TMR Scheme (Marie Curie Fellowship) and from ESRC is gratefully acknowledged.
AbstractA number of recent formal models predict a positive effect of political knowledge on turnout. Both information acquisition and turnout, however, are likely to be determined by a similar set of variables, rendering hard the identification of a causal link in empirical investigations. Available empirical regularities should therefore be interpreted as mere correlations. I address this problem by using an instrumental variables approach, where the instruments are represented by various proxies of information supply on mass media. Using survey data from the 1997 British General Election Study, I show that political knowledge has a sizeable influence on the probability of voting and that mass media play an important role in influencing political participation.