In 1970 therer were a lot of famers that procduced in their own way. Only a small part from the meat buisness was regulated by 4/5 big companies. In time the big companies got more and more influence and possesed more of the market. Because the companies want to sell the same meat in every store the farmes need to produce exactly the same meat.
The brothers mac donald came with a brilliant idea; fastfood. They started with a small drive through were people could get food. After a succesfull time they changed the game and got rid of a a lot of food on the menu and a lot of employers. So they could make the proces faster (fastfood) to let the restaurant work like a factory with a lot of people who do simple mass production jobs.