That is the new book by Thomas Philippon, and perhaps the title is a bit misleading, as the book covers both regulatory barriers and natural economic forces behind higher concentration levels. I am a big fan of Philippon’s work, but I am not so convinced by his arguments in this book. Most of all, he is trying to argue for systematically greater monopoly power in the American economy, but he is reluctant to provide much evidence for output restriction, the sine qua non of market power.

First note that market power does not seem to be up at the level of actual market competition. And capital’s share of income does not seem to be rising in a manner consistent with the monopoly theory, see here and here.

I agree with him about health care, and also (highly regulated) cable television and thus internet connections. I agree with all of his suggestions for removing regulatory barriers to entry, for instance by allowing foreign airlines to serve domestic U.S. markets. From a policy point of view, I am quite close to his perspective.

But when it comes to monopoly power too much of his evidence is circumstantial. OK, there is greater stability for market leaders in many sectors, and weak investment aggregates, but all the time antitrust suits find evidence for output restrictions — so why doesn’t this book offer more of such evidence? Here is one passage (p.39) that caught my attention:

…we see a sharp increase in concentration in the airline industry after 2010. That is enough to trigger our interest, but not enough to conclude that competition has weakened. We must first check that concentration has also increased at the route level. We find that it has. We can further show that it came together with higher prices and higher profits.

I have only a pre-publication copy, and perhaps some of the book is missing in my edition, but I don’t see the cited evidence presented, nor is it in the airlines section starting on p.137 (which does document increasing concentration at the national level). To consider the contrary evidence, here is an excerpt from an earlier MR post:

As for output restrictions, here is the DOT series on aggregate miles flown. No doubt, there are problems around the time of 9/11 and also the Great Recession, with 2008-2012 being a period of slight quantity contraction. But in 1985 there were 275,864 [million] total miles flown, in 2006 it was 588,471, and 641, 905 in 2015. I’ll ask again: if there is so much extra monopoly, where are the output restrictions? Or look at the price index. Overall prices are down considerably since 2008, and from about 2000 to 2016 they run from about 250 (eyeballing) to about 270, noting 1998-2010 saw a huge run-up in oil prices.

Since I wrote that post there is clearer evidence for a steady price decline since 2012 (he is claiming higher concentration since 2010), just look at the price index, which is FRED channeling BLS. Now maybe those are the wrong numbers for some reason, but I don’t see anything in the Philipson book to counter them. I don’t see output restriction considered at all. I don’t see a price series presented at all.

That is only one sector, but it reflects my deeper worries about the book. I just don’t see the evidence for output restrictions, or, in many cases I don’t see the evidence for higher prices.

The most sustained discussion of prices comes on pp.114-122, where it is shown that PPP-adjusted prices are higher in America than in Europe, and furthermore the gap is growing. That is far too much aggregation for my tastes (“Europe”), PPP adjustments are not exactly scientific, it is not very direct evidence for market concentration being the culprit, and furthermore if I understand him correctly, the Big Mac index also has the United States becoming relatively more expensive, even though McDonald’s clearly has faced massive competition in recent years.

To be sure, if you believe in a productivity slowdown, as I do, you also have to feel that America’s economic sectors, in some counterfactual sense, could be much more dynamic, more prone to disruption, and yes more competitive. It is a great disappointment to me that is not the case. But that is far from the view that monopoly power is increasing in the American economy in an economically significant manner, across a wide variety of sectors (health care caveat noted, and even that is selective, as there has been a significant cost slowdown).

So I remain skeptical about the main claims in this book.