market price support is net of producer levies and excess feed cost market price support is net of producer levies and excess feed cost the composition of support is important because how support is provided determines its impact on the agricultural sector and the distribution of benefits to society as a whole for example market price support can have a large effect on production and trade but it imposes additional and regressive costs on domestic consumers is not effective in improving farm income and can have negative effects on the environment on the other hand income support not based on current commodity production is much more effective at improving farm income with less spillover effects policies that directly target noncommodity criteria such as landscape elements environmental performance or traditional breeds of animals are also typically more effective at reaching these societal objectives