Reducing agricultural tariffs and domestic support can have different impacts on developing countries. High levels of protection and support for farmers in rich countries can lower world prices, affecting developing countries. Least developed countries are disproportionately affected by agricultural support policies. Cutting tariffs would benefit developing countries as a whole, but cutting domestic support would lead to a welfare loss for them. However, least developed countries would experience a small gain from cutting domestic support. Tariff reductions by World Trade Organization members would have a positive effect on welfare for all developing countries.