-41- tion of population 46/ in the more southerly markets possibly tended to make the few large plants the most efficient size processing unit in those areas. This is a result of the economics of large-scale fluid milk processing facilities. In addition to the sizeable market share of fluid milk sales held by large firms, they marketed an even greater portion of the fluid milk by-products consumed in each area. In every market, small dairy firms sold a smaller portion of skim milk products, fluid creams and cottage cheese than of fluid milk.47/ The continued practice of many small dairy firms of offering a full line of dairy products with relatively small sales volumes for most by-products may well be ex- cessively expensive. In such small firms, however, the problem of joint costs for many products makes for complex decisions as to adding or dropping one. Milk Distribution Methods Marketing Channels The distribution and final sale of dairy products to consumers may be accomplished through several alternative marketing channels (Fig. 4). Processing and distributing firms, including producer- distributors, may obtain their supplies of raw milk, cream and other dairy ingredients from numerous sources. Dairy farmers, each shipping to a single plant, are the normal origin for the largest part of milk supplied to most dairy processing plants. Temporary supply sources and emergency milk shipments during periods of short production may origin- ate with milk brokers, other processing firms and farmer cooperative bargaining associations. These firms may arrange shipments from pro- duction areas within Florida or from other states. An additional source of supply to producer-distributors is milk produced by herds on their own farms.4"/ Processing and distributing firms use many combinations of mar- keting channels to move packaged dairy foods to consumers. The most direct channel is retail sales of products to consumers from company- owned retail dairy stores or house-to-house delivery routes. Firms also sell at wholesale directly to retail food outlets (grocery stores, eating places, soda fountains) institutions (hospitals, schools) and 4Z/The only exception being a slightly smaller portion of cream than fluid milk sales by large firms in Central Florida. 48/Volumes and relative amounts of milk supplies received from all sources will be presented in the next section.