4. A Gallon of Milk
In the year 1900, professional milk men would go door-to-door delivering glass bottles of fresh milk to people’s homes. Since it was years before every person had a refrigerator in their house, this was completely necessary. People typically only purchased what they needed on a daily basis, instead of buying one gallon to last the week. Today, a gallon of milk is almost $4, but back in 1900, it was just a dollar.
