Author makes a good point. You must always compare prices per the same unit of measure. This shrinkage thing has been going on for a while. Real sneaky.
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At some point in the not too distant future, certain items like coffee, chips, and candy bars are going to shrink to where they wink out of existence, having become a singularity.
At this rate... our grandkids are going to be asking us “Pop pop, did they have the small complementary magnifying glass taped to the outside when you were a kid?”