Lars Smith highlights one of the most depressing trade-offs - ethnic diversity reduces social spending and redistribution. He cites this paper (pdf) by Alberto Alesina and colleagues. But we could add this (pdf) from Enzo Luttmer and this (pdf) from John Roemer.
The question is: why? This fine book by Joe Oppenheimer and Norman Frohlich (some of which is summarized here (pdf)) might give us clues. They've conducted laboratory experiments to find out how much demand there is for redistribution. And they've found that redistribution increases when there's more communication within groups and less suspicion that people will free-ride upon others' efforts. Maybe ethnic diversity reduces redistribution, then, by reducing communication and increasing the suspicion that one will be taken for a mug.
But this merely raises another issue, which Amartya Sen complains about in Identity and Violence* - why is ethnicity so salient? Why don't differences in height, regional background or the football team you support retard redistribution? Why do people identify so much with their ethnicity?
Which raises another question. If our identification with ethnicity is irrational and arbitrary, why should it count as a good reason against redistribution? Why should irrational beliefs have any moral status?
Lars cites Milton Friedman as saying: “You cannot simultaneously have free immigration and a welfare state.” But maybe there's a deeper problem for egalitarians - can you simultaneously have democracy and redistribution?
* I've only just started reading this; I'll review it soon.

Correlation problem here? Suppose that immigration into 1950s Britain had been from other high trust societies e.g. another influx of Danes. Would the consequences be the same as for an influx from low trust societies e.g. Jamaica or Pakistan? And that thought-experiment still has a correlation problem, since Danes look much like us.
Posted by: dearieme | September 13, 2006 at 10:57 AM
You might also have cited this book, which is very good on race and redistribution...
http://www.oup.com/uk/catalogue/?ci=9780199286102
Posted by: Jarndyce | September 13, 2006 at 11:42 AM
But how would you rate Poland or Italy, both of which contributed substantial numbers of immigrants in the 1950s, for high- or low-trust? I'd rate them both quite high-trust, with the caveat that Italian trust levels vary dramatically between what you might call official (politics) and unofficial (community/family) fields.
That it's necessary to point out that there were quite a lot of immigrants other than Pakistanis in the 50s, IMHO, bears out Chris's point.
Posted by: Alex | September 13, 2006 at 11:43 AM
A prior influx of Danes was not without conflicts, e.g. the attempted genocide on St. Brice's Day, 1002.
Posted by: Lars Smith | September 13, 2006 at 11:51 AM
Surely there are good genetic reasons for this - we trust people like ourselves more, as we are more likely to share genes with them.
Also, your statement that we cannot have both democracy and redistribution seems a bit unjustified: I always thought that democracy and redistribution went hand-in-hand, as a democratic governments are likelier to try this kind of short termist solution, as a way of looking good to the voters.
Posted by: Steve M | September 13, 2006 at 12:30 PM
Steve M - democracy's fine for redistributing towards the median voter. But does it really guarantee a good deal for the worst-off?
Posted by: chris | September 13, 2006 at 01:11 PM
"But how would you rate Poland or Italy, both of which contributed substantial numbers of immigrants in the 1950s, for high- or low-trust?" I wouldn't rate them; I don't know enough about them, which is why I picked easy ones.
"That it's necessary to point out that there were quite a lot of immigrants other than Pakistanis in the 50s": but it isn't necessary - "e.g." means "for example", not "here's an exhaustive list".
My point is that "diversity" alone is a pretty silly measure if you don't account for the component parts of the mixture. Otherwise you could say that Stornoway is diverse - there's Macleods and Macleans and Morrisons and Nicolsons and.....
Posted by: dearieme | September 13, 2006 at 02:29 PM
"Why do people identify so much with their ethnicity? "
A partial answer is given in this talk by Leda Cosmides and James Toobin which discusses the issue and some experimental results:
http://name99.org/blog99/?p=69
The data is way too sketchy to derive serious conclusions yet, but their claim is that ethnicity is a proxy for "being on the same team", "being part of the same unit", the sort of explanation you'd expect from evolutionary psychology.
Posted by: Maynard Handley | September 14, 2006 at 08:24 PM
I am interested in whether we can have "Climax Capitalism" and democracy.
Posted by: dilbert dogbert | September 15, 2006 at 05:20 PM
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