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AbstractThis paper develops a probabilistic voting model in which a single lobby group commits campaign contributions to parties, contingent on the policy position the party adopts. Parties may have different propensities for diverting campaign funds towards rents. We show that a party that skims more from contributions mobilises fewer uninformed voters but places more value on receiving greater contributions. Further, the contributions and vote share of the party increases with the distance between the lobby's preferred policy and the median voter's ideal policy. Finally, we show that the equilibrium policy is between the median voter's ideal point and the lobby's preferred policy. Such an equilibrium policy does not maximise the aggregate social welfare due to the distortionary nature of lobbying. However, when an appropriate contribution tax is introduced to limit this distortion, social welfare will be maximised.

AbstractWe develop a game‐theoretical model in which the politicians can be influenced by means of campaign contributions of special interest groups. If there is no legally binding contract, politicians have a proclivity to divert some contributions for private use. In doing so, they maximize their own utility which depends on expected election‐winning premium and amount of funds misappropriated. We study the utility maximizing fraction of expropriation emerging from the equilibrium policy platform and the associated contribution level. We then compare results under alternative scenarios, namely, one single lobby group versus multiple lobby groups and one‐sided lobbying versus two‐sided lobbying.

This manuscript version is made available under the CC-BY-NC-ND 4.0 license: http://creativecommons.org/licenses/by-nc-nd/4.0/ which permits use, distribution and reproduction in any medium, provided the original work is properly cited. This author accepted manuscript is made available following 24 month embargo from date of publication (May 2018) in accordance with the publisher's archiving policy ; This paper studies the effect of lobby groups on electoral competition and equilibrium policy outcomes employing a 'money for policy favours' model of lobbying. Our results show that when a lobby group seeks to influence an electoral outcome, it will make a financial contribution to only one political party whose policy is closely aligned to its own ideal policy. When misappropriation of campaign funds occurs, political parties that divert more funds for personal gain stand on more independent platforms and require larger contributions from lobby groups. Greater electoral competition could reduce policy distortions but this, in turn, sparks more intense lobbying thereby increasing the scope of misappropriation of funds. In the case of multiple lobbying, political parties either demand different levels of campaign contributions or leave them with different levels of satisfaction. ; This research did not receive any specific grant from funding agencies in the public, commercial or not-for-profit sectors.