Self interests overcome public interests as politicians are being payed more, and the when polarization of policy increases. politicians become more opportunistic, when other politicians in the system are opportunistic.<ref>[http://www.cesifo-group.de/portal/page/portal/lang-en/DocBase_Content/WP/WP-CESifo_Working_Papers/wp-cesifo-2004/wp-cesifo-2004-06/cesifo1_wp1228.pdf Politicians’ Motivation, Political Culture, and Electoral Competition](a theoretical paper!)</ref>