When it comes to grocery shopping the US system is bad. Take for example ground beef: There's a few brands, both with the same labels: grass fed, no hormones .e

When it comes to grocery shopping the US system is bad. Take for example ground beef: There's a few brands, both with the same labels: grass fed, no hormones .etc etc. What's the most important then? The price tag. But each unit of ground beef isn't always the same size: 1.08 lbs, or 1.23 lbs ,etc. Fortunately vendors are required to put a price PER unit of weight. In metric system countries it would be : Brand A is 7€/kg, Brand B is 5€/kg , (and for the sake of the argument, Brand C is 0.65c per gram, but usually it's always per kg.) Which one is the cheapest? Easy answer. Brand B < Brand C < Brand A In the US? One is $5/lbs , the other is 35c per Oz. Which one is the cheapest? In this base 10 world, It's a bit tricky to make base 16 conversion by head Same with liquids: fl oz, gal, etc. with the Metric system? €/cl , €/l , they could even write €/ml, multiplying/dividing by 10, 100, or 1000 doesn't' requires a calculator. Even if you only have the price per unit, for the same brand: 1 bottle of 2L is $3, 6 bottle of 500ml is $3, here buying the 6 pack is better. (Usually the bigger the bottle, the cheaper per unit of volume, but not always, especially in the US) In the US? 1 gallon is $3, but a 6 pack of 16 fl oz is $3, which one is the cheapest? 6*16 = 96. but 1 gallon is 128 floz, so the 6 pack is 75% of a gallon, so the gallon is cheaper here