The pluralism in economics movement is a campaign to 'enrich teaching and research and reinvigorate the discipline... [and bring] economics back into the service of society'. Dalen writes that economics had greater scientific pluralism in the past compared to the monist approach that is prevalent today. Pluralism encourages the inclusion of a wide variety of neoclassical and heterodox economic theories - including classical, Post-Keynesian, institutional, ecological, evolutionary economics, feminist, Marxist and Austrian,stating that "each tradition of thought adds something unique and valuable to economic scholarship."