[bluefirebrand]

People in general aren't very good at two things:

Distinguishing needs from wants

and

Estimating how much of something is necessary to fulfill a need.

[bobthepanda]

To be fair, shrinkflation of some products also now makes it hard to buy nice round amounts of things.

The recipe for a cake I made recently calls for 14 oz of maple syrup. I can buy it only in 12.7 oz bottles.