I don't know if this is more evidence that Herr Doktor Professor Krugman has farmed out his column to some annoying undergraduate, thinks his readers are stupid, or both. Krugman is responding to claims by Stanford economists Boskin and Taylor that (I paraphrase) the Reagan years ushered in good economic times. Then, mysteriously to me, Krugman shows us a graph from the BLS that shows multi-factor productivity growth in time chunks that don't correspond to presidential terms. I'm just a humble law professor, but is this as dumb as it seems?
Productivity, yes, productivity is good, but it's not the same thing as economic growth and it's not the same thing as wealth. Suppose your business is going gangbusters. You have so many orders you have to pull the old widget maker out of mothballs and fire it up. You have to bring in every loser nephew and cousin you can lay your hands on to take orders and man the night shift. Business is too good! You are making money, but productivity, which is how much you can squeeze out of the additional factors of production (machines, nephews) is actually going down. Lately I have heard even in our current high unemployment, low growth doldrums, productivity is up because producers are squeezing more out of the workers and capital that they have. In short, WTF is Krugman talking about?
Moreover, this is the age of the interweb. Any idiot can google GDP growth and see the numbers. Here's a plot of real and nominal GDP growth rates since WW2 or so. You can see it all -- the huge spurt in 1949 or so, the Carter recession, the Reagan recovery, our current sad state. Remember, this is just rate of growth, i.e. rate of change in GDP. Here is GDP itself over the post WW2 moment. You can see why people say of the 1980s and '90s -- them were good years! And also why 2007 until now looks so spooky. What the heck is that kink in the GDP growth path doing there?
In short, it looks like Krugman pretty much pulled the first irrelevant graph off the first website he stumbled upon that would look to the naive like the last 30 years of the 20th century weren't economically so great. And then he uses that to assert that conservatism must be corroding the minds of Boskin and Taylor who as far as I know have never written anything so transparently idiotic as Krugman is presently foisting upon the reader. This, when instead of throwing a great gob of bullshit at us, he could have simply referred us to the actually relevant and easily available data and said, see, there's a lot of ups and down in the growth rate (business cycles, anyone? To which changes in productivity surely are relevant), but it looks like we have been on a pretty steady upward path in total GDP until, uhm, recently. Not as much political punch either way in saying this, but at least you are not insulting everyone's intelligence, even those who are not that intelligent to begin with.

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