This question is too weird for a finance position, unless the position requires entertaining a bestsellers freak client. Or at least a pop economics sucker client, the kind that likes the book freakonomics.
It also sounds appropriate for a bookstore employee or journalist.
Otherwise, either they threw that question to end the interview quickly, because it doesn't seem to measure any kind of finance competence, or, the position in fact requires someone good at BS and pop economics.
I've never heard prospective English teachers being asked about the economy or the stock market, or if they know what the VIX, convexity, delta or gamma are.
EDIT:
Just looked it up on amazon.
Maybe the guy was in fact interviewing for Gavekal research
This book is too esotheric. I read a lot about the markets and I've never heard of it. There's nothing there I haven't seen elsewhere: cycles, bubbles, a crash is coming blah blah.
Not fair to ask this to someone right out of college. In college, econ professors make a point of mocking and disdaining all macroeconomists not teaching at a top 10 program, so it's very unlikely for even an econ major to even hear about this kind of thinking.