agricultural issues center university of california july 2006 assessment the political market power milk producers reflected in us pricing regulations byeong il ahn and daniel a sumner department resource economics davis ca 95616 is ph d candidate at frank h buck jr professor director member giannini foundation corresponding author primal ucdavis edu tel 530 754 8171 fax 752 5614 ______________________________________________ this paper was presented western association international 81 st annual conference san diego june 29 to 3 authors wish acknowledge very valuable comments from richard sexton christopher knittel bees butler acknowledges kristina hansen for editing an earlier draft manuscript work funded part by marketing abstract