Paul Krugman
princeton.edu/~pkrugman · Personal blog · on HN since 2008
Paul Krugman's Princeton page, hosting academic papers, talk slides and essays by the Nobel-winning economist.
What HN saysHN mostly links his playful 1978 paper on interstellar trade, which commenters call brilliant, a classic and a quick, light-hearted read.
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Most-shared posts
- 1The Theory of Interstellar Trade (1978) [pdf]27 people · 177 points · first shared 2008 · 57 comments on HN
- 2How I Work by Paul Krugman2 people · 2 points · first shared 2008 · 1 comments on HN
- 3Paul Krugman: How I work1 people · 135 points · first shared 2008 · 47 comments on HN
- 4Krugman's Nobel Talk slides1 people · 12 points · first shared 2008 · 2 comments on HN
- 5Paul Krugman: Incidents from my Career1 people · 10 points · first shared 2008 · discussion on HN
- 6The "New Economic Geography", now middle-aged [pdf]1 people · 1 points · first shared 2025 · discussion on HN
- 7Geography.pdf1 people · first shared 2009
- 8Enron1 people · first shared 2020
- 9Scale econ.pdf1 people · first shared 2009
- 10Malthusian.png1 people · first shared 2012
- 11Japans trap.pdf1 people · first shared 2020
What HN people wrote when they linked it
JackFr · 2022-11-16
In general not a Krugman fan, but this is brilliant
https://www.princeton.edu/~pkrugman/interstellar.pdf
The Theory of Interstellar Trade, in which he develops a theory of trade where differences in time due to relativistic speeds is considered.
fjsolwmv · 2018-01-08
You don't need relativity, this problem is already answered by distributed systems that lack TrueTime clock guarantees. Today have to make arbitrary and inconsistent choices. (Or "eventually consistent", but then you lose some level of resolution in your ordering of moments)
Related, this classic economic article: https://www.princeton.edu/~pkrugman/interstellar.pdf
avian · 2016-11-29
Link to the original PDF that does not endlessly nag you to subscribe to the newsletter:
https://www.princeton.edu/~pkrugman/interstellar.pdf
wmf · 2015-09-22
This is a classic: http://www.princeton.edu/~pkrugman/interstellar.pdf
hnnewguy · 2014-11-30
As an economics undergraduate, Paul Krugman's paper on The Theory of Interstellar Trade was a must read, exclusively for its light-heartedness:
https://www.princeton.edu/~pkrugman/interstellar.pdf
(12 pages, quick read)
pauljonas · 2012-05-16
Up until 1800, Malthus was spot-on -- any advance in technology that was greeted by population increase would snap back to an equilibrium, with war|disease|hunger inflicting the correction. Gregory Clarke goes into great detail, with statistics on caloric consumption, lifestyle, etc.. that show that the average person at the pre-dawn of the industrial revolution did not experience conditions much more favorable than those of Roman times.
http://www.princeton.edu/~pkrugman/malthusian.png
teraflop · 2011-04-08
This thread is not complete without a link to Paul Krugman's paper, "The Theory of Interstellar Trade". Abstract:
This paper extends interplanetary trade theory to an interstellar setting. It is chiefly concerned with the following question: how should interest charges on goods in transit be computed when the goods travel at close to the speed of light? This is a problem because the time taken in transit will appear less to an observer travelling with the goods than to a stationary observer. A solution is derived from economic theory, and two useless but true theorems are proved.
http://www.princeton.edu/~pkrugman/interstellar.pdf
throw0101a · 2020-12-26
Inflation = quantity x velocity
Velocity is low/zero, and so the product will be small/zero.
People have been going on about inflation for literally a decade, since QE1 started under Bernanke:
> We believe the Federal Reserve's large-scale asset purchase plan (so-called "quantitative easing") should be reconsidered and discontinued. We do not believe such a plan is necessary or advisable under current circumstances. The planned asset purchases risk currency debasement and inflation, and we do not think they will achieve the Fed's objective of promoting employment.
* https://economics21.org/html/open-letter-ben-bernanke-287.html
Meanwhile Keynesian folks like Krugman have been saying we're in a liquidity trap because of the ZLB on rates:
* https://en.wikipedia.org/wiki/Zero_lower_bound
Japan has been in this situation for decades, and Krugman has been writing about it for just as long (1998):
* https://www.princeton.edu/~pkrugman/japans_trap.pdf
So we have a testable hypothesis: the inflationistas have been yelling about this for over a decade, and the (e.g.) Keynesians have been saying 'we'll be fine given the conditions'.
Given the (empirical) results, I'll continue to follow the Keynesians. If at some point they end up being wrong, then I'll re-consider (assuming they don't self-correct and figure out why their models got it wrong).
shoo · 2020-04-04
> The theory of interstellar trade is a well-understood topic, with an extensive literature consisting of one paper (pdf) I wrote in 1978. Interstellar finance, however, is less well covered.
> That’s all about to change, however. I’m reading an advance copy of Charlie Stross’s Neptune’s Brood. (Hey, I have connections!) And it is the best thing by far written on the subject to date, partly because it is, as far as I know, the only thing written on the subject to date.
> It’s also a fantastic novel.
https://krugman.blogs.nytimes.com/2013/05/20/the-theory-of-interstella…
> This paper extends interplanetary trade theory to an interstellar setting. It is chiefly concerned with the following question: how should interest charges on goods in transit be computed when the goods travel at close to the speed of light? This is a problem because the time taken in transit will appear less to an observer travelling with the goods than to a stationary observer. A solution is derived from economic theory, and two useless but true theorems are derived.
https://www.princeton.edu/~pkrugman/interstellar.pdf
ahartmetz · 2026-07-16
You're not the first person with... an opinion on economic "science".
Paul Krugman:
https://www.princeton.edu/~pkrugman/interstellar.pdf
"This paper, then, is a serious analysis of a ridiculous subject, which is of course the opposite of what is usual in economics."
erehweb · 2025-04-06
See also Krugman's paper on the theory of interstellar trade https://www.princeton.edu/~pkrugman/interstellar.pdf
Majromax · 2024-09-29
For an extensive discussion of similar issues, see Paul Krugman 1978, "The Theory of Interstellar Trade:" https://www.princeton.edu/~pkrugman/interstellar.pdf.
joshuanapoli · 2023-11-20
Alpha Centauri is simply a weird earth. I think that a game around long-lived creatures that colonize a galaxy and have to work with relativistic effects could be different and fun. At some level it builds on all these different ways of looking at time. Breathe some life via simulation into this tongue-in-cheek interstellar economics: https://www.princeton.edu/~pkrugman/interstellar.pdf
addcommitpush · 2023-05-25
Well I do not know if it's going to be profitable but at least the foundation of interstellar trades have already been studied: there's a published paper on it by Krugman (https://www.princeton.edu/~pkrugman/interstellar.pdf)
nabla9 · 2020-06-22
Another:
* They tie big names into the firm to get credibility. Hire them into the board, or pay them good money for short term consulting gigs.
Examples:
1) Gen. James Mattis was in Theranos board. So was Henry Kissinger and George Shultz.
2) Enron paid Paul Krugman $50,000 to attend at least two times in advisory board meetings, nothing related to Enron business. What Enron really bought was the ability to say Paul Krugman was in the advisory board. https://www.princeton.edu/~pkrugman/enron.html
brudgers · 2018-07-15
regular PDF, https://www.princeton.edu/~pkrugman/interstellar.pdf
rckrd · 2017-03-18
Relevant might be Paul Krugman's college thesis at Princeton, "The Theory of Interstellar Trade"[0]
[0] https://www.princeton.edu/~pkrugman/interstellar.pdf
ars · 2017-02-01
> Watch those financial investments pay off.
You might find these papers on Interstellar finance interesting:
https://www.princeton.edu/~pkrugman/interstellar.pdf
http://www.espenhaug.com/SpaceTimeFLong.pdf
patrickphilips · 2014-02-14
Reminded me of Krugman's Theory of Interstellar Trade (http://www.princeton.edu/~pkrugman/interstellar.pdf)
flourpower · 2011-11-27
This is unfair. Some of his work is built around general relativity:
http://www.princeton.edu/~pkrugman/interstellar.pdf
loganfrederick · 2011-02-07
Not directly related but topically relevant link to Nobel Prize-winner Paul Krugman's paper on "The Theory of Interstellar Trade":
http://www.princeton.edu/~pkrugman/interstellar.pdf
danteembermage · 2009-09-12
The original article (it's listed in the wikipedia references and is a fun read if you're into trade theory and/or spaceships)
http://www.princeton.edu/~pkrugman/interstellar.pdf
gjm11 · 2009-01-10
"The theory of interstellar trade": http://www.princeton.edu/~pkrugman/interstellar.pdf
"This paper, then, is a serious analysis of a ridiculous subject, which is of course the opposite of what is usual in economics." Although he calls it "serious", it's full of little jokes, some of them very good.
smanek · 2009-01-10
I guess it's a matter of definitions. The kind of linguistics Chomsky worked on were rather mathematical, for example, see the Chomsky Hierarchy (http://en.wikipedia.org/wiki/Chomsky_hierarchy) which is used extensively in Computer Science.
And Krugman's actual papers are basically pure math. I'm having trouble finding many of his papers that aren't behind a pay wall, but see http://www.princeton.edu/~pkrugman/scale_econ.pdf or http://www.princeton.edu/~pkrugman/geography.pdf. And if memory serves, didn't he also write a paper on the effects of special relativity on the time value of capital? (I can't seem to find a copy ...). I know econ is only a 'dismal science,' but don't be too hard on it ;-)
rcoder · 2008-10-13
Anyone here who hasn't read Krugman's paper on the economics of interstellar trade owes it to themselves to do so:
http://www.princeton.edu/~pkrugman/interstellar.pdf
I've never laughed so hard that coffee went up my nose while reading an econ paper prior to coming across this one. (Okay, and maybe the first version of the Paulson bailout, but that was a very different sort of laughter.)