Evidently Tyler Cowen will offer that message in an “e-book single.” From the description:

In a figurative sense, the American economy has enjoyed lots of low-hanging fruit since at least the seventeenth century: free land; immigrant labor; and powerful new technologies. Yet during the last forty years, that low-hanging fruit started disappearing and we started pretending it was still there. We have failed to recognize that we are at a technological plateau and the trees are barer than we would like to think.

So, we have an innovative product–a mini-book that will sell for just $4–to tell us that we have stopped coming up with valuable innovative products. I have not read it yet. But it would appear to be both self-recommending and self-refuting.