Screaming Penguin - Source Does Matter

About this post by Kevin Drum, which read:

Alex Tabarrok reports that the vast majority of professional economists are unable to correctly answer a question that appears on page 4 of a very popular beginning economics text. I wonder how many other professions would produce similar results?

The funny thing is, I still occasionally get a question from a beginning CS major on something mundane -- usually something that relates to optimal datastructures I don't think about much anymore because my APIs give them to me for free -- about how a lot of people forget some low level stuff that students are taught in order to gain a line of thinking rather than commit a particular bit of information to memory...

Then I read the the question. That's just... wrong.