Supermarkets wear the pants in the dairy business. Consolidation has increased steadily since the early 80s.
Now we find from the above link:
A&P, Century-Old U.S. Grocery Store Owner, Files for Bankruptcy
Great Atlantic & Pacific Tea Co., operator of almost 400 supermarkets under names including Waldbaum’s, Food Emporium and Pathmark, filed for bankruptcy after failing to compete with wholesale clubs and drugstores.
Further consolidation will not serve the public's interest.