Governmental intervention in the sphere of marketing has become a feature of increasing frequency in the post-war economic policy of many countries, particularly during and since the economic depression of 1930 to 1932. In general, raw materials and foodstuffs have been made the object of regulations by authorities and statutory bodies more than manufactured articles, since the producers of the latter are usually able to come to voluntary agreements in relation to prices, limitation of production, &c., without the help of the Government. The general factors and ideologies which have brought about this considerable public intervention into a sphere which was left predominantly to private enterprise in pre-war days, are more or less common to all countries, but the particular difficulties and problems which have prompted statutory measures differ from country to country.