I huge reason was a huge majority of people drank milk every meal, every day. Kids had cereal which needed milk. Families typically had one car but yet someone had to run to a market if it wasn’t delivered. The shear number of families that don’t drink much milk today makes it very hard to make a living delivering milk. There are other forms of calcium too. Milk was a staple of every meal either at home or at a restaurant. Now it’s unusual to see someone getting milk when not eating at home.
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