Dairy farms get together to raise prices, putting the squeeze on your local grocery store. The local store raises their prices to cover their higher costs. People blame the grocery store.
Then the grocery store responds by spinning off a separate store. One store will only sell milk in cardboard cartons and cheese. The other store will only sell milk in plastic bottles or yogurt. This is, of course, to make your life easier.
Of course, there’s always The Oatmeal’s explanation.
One store pipes fresh delicious milk direct to your faucets, but only carries 1% because the dairy cartel is being paid by another grocery chain for an exclusive right to whole, skim, and 2%.