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 policyThis 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...