Agriculture is primary production: It relies on the use of natural resources, the base of human life. Its products satisfy the very basic needs of our existence. Almost everywhere in the world, it gets a special attention from politics, in Switzerland it gets public founds and profits from import restrictions. However, the provision with food and inputs for agriculture highly depends on international trade. Nature's caprices, market forces and political intervention - all of them influence the individual farm. Is there a field of study more interesting than this one?