Ummm where did you live because that stopped waaay before the 90’s/2000’s in my area (more like 1960’s/70’s)
But as to why, it was often more of a local operation and in reusable glass containers. So the milkman would pick up the empties and drop off fresh.
Milk also didn’t used to be ultra pasteurized, so sitting on store shelves would take a lot of time off its lifespan.
Milk delivery has a *muuuuch* longer history than the 90s. Before refrigeration, the only way to get milk in the city was for people to deliver it to your door in the morning, fresh from the farm.
Refrigeration technology has reduced milk delivery by a lot, but some people still use it to support local farms and get super fresh milk.
Edit: Also worth mentioning other reasons like tradition… and also convenience. It’s nice to have fresh milk brought right to your doorstep every day, without having to go to the grocery store.
The closest thing to this I’ve seen since my childhood in the early 70s is a chain of convenience stores in East Tennessee called Weigel’s. They don’t deliver to your house, but their milk comes directly from company owned farms in the Knoxville area and is sold “fresh” in their stores. You can return the cubic containers for money off of the next gallon you buy.
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