Okay kiddo, so imagine you have a lemonade stand and you sell cups of lemonade to people. Now one day, a big company called Midcal Aluminum decides to sell something that can make cups like yours. This makes it harder for you to sell your lemonade cups because people might choose to buy cups from Midcal instead.
Well, something kind of like this happened in California with alcohol. The California Retail Liquor Dealers Association (CRLDA) was a group of small alcohol businesses (like your lemonade stand) that sold alcohol to people. Midcal Aluminum was a big company that made things like cans and bottles for the alcohol to be sold in.
The CRLDA was worried that if Midcal could sell its stuff to alcohol businesses, then it would be harder for the small businesses to sell their alcohol. So, they went to court to try to stop Midcal from selling their stuff to alcohol businesses.
But the court said that the CRLDA couldn't do that. The court said that Midcal could sell their stuff to alcohol businesses because it's important for companies to be able to sell things to other companies to make a profit.
So, the CRLDA lost the case, and Midcal was able to keep selling their stuff to alcohol businesses. This made it harder for the small businesses to compete, but it also helped Midcal make more money. And that's kind of what the case was all about!