why dont more people use a glass bottle and a milkman?
Three reasons:
1) Many places aren’t served by a milkman so it’s not an option
2) Changing patterns of work – fewer “housewives” at home and therefore more houses already unoccupied by the time the milkman would arrive (exacerbated by longer commutes: in the olden days most people lived near where they worked and didn’t have to leave the house at six-seven o’clock to commute many miles)- milk left out all day would be (a) rancid by teatime and (b) an advertisement to your local burglar that the house is empty
3) It’s cheaper from the supermarket. This is also a big factor in (1).