-39- TABLE 23.--Average Percent Utilization of Processing Capacity in Fluid Milk Processing Plants by Milk Marketing Area and Size of Plant, April and October 1959 Size of : Milk Marketing Area: All Plant :Northwest :Northeast :Central: Tampa Bay: Southeast: Areas Percent Small 34.8 37.5 53.5 77.7 54.7 46.8 Medium 71.8 53.6 121.1 48.5 59.8 64.1 Large 57.4 91.0 70.6 30.8 62.8 58.4 All Plants 60.6 63.3 77.6 34.1 62.2 59.9 Source: Based on data in Table 20 and Appendix B. medium firms operated at the highest capacity. Largest size dairy plants in Northeast and Southeast Florida were most efficient. Changes over time in relative market shares of the various milk plants could be a possible cause of the variation within size groups in percent of capacity utilized. Firms of any size can experience declining market shares of total fluid milk sales. If processing equipment were of optimum capacity when purchased, declining sales would result in lower utilization of the rated plant capacity. Unfortunately, data are not available to show whether such changes in market shares did occur over time. Also, a firm may build a new large plant in anticipation of market growth. Until the expected increase in volume is realized, processing capacity will not be utilized at the rated level. Market Shares of Firms The market share of fluid milk sales for small firms tended to decrease with increasing size of market (Table 24). In Northwest Florida, where there were no large firms, eight small plants shared slightly more than ten percent of the total market sales of fluid milk. In Northeast Florida, the combined sales of nine small firms was 14.6 percent of the market. The one large firm in this area averaged 17.4 percent of daily market-wide sales. Approximately two-thirds of the total fluid milk sales in Tampa Bay was shared by four large dairies; in Southeast Florida, five plants shared about two-thirds of