books: Why The Internet Doesn't Know Anything

I happened upon a perfect visual this afternoon while checking books:

Same book, same edition, two listings, prices as you can see.

I may have this printed onto a laminated card, for flashing at anyone who disputes my valuation of their books with the despicable rejoinder "but the INTERNET says...."


It's a useful tool, but like any tool its usefulness is largely dependent on the skill of the wielder.