Predictability
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The Milkman
Originally, milk needed to be delivered to houses daily since the lack of good refrigeration meant it would quickly spoil. The near-ubiquity of refrigerators in homes in the developed world, as well as improved packaging, has decreased the need for frequent milk delivery over the past half-century and made the trade shrink in many localities sometimes to just 3 days a week and disappear totally in others. Additionally, milk delivery incurs a small cost on the price of dairy products that is increasingly difficult to justify and leaves delivered milk in a position where it is vulnerable to theft.