@Mise: who is "we"? I certainly don't agree with the benefits of racial quotas. I think that decades of race-based AA worldwide, from Malaysia to the US, have produced far more harm than good. The minorities who catched up with the majority group didn't need AA; the minorities who get AA never caught up. It's an abject failure.
The "we" I'm talking about is merely "people who agree with AA". Or perhaps liberal left-wingers in general, since the arguments in favour of AA typically coincide with arguments in favour of anti-discrimination laws more generally, and they are typically espoused by the liberal left.
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@SiLL, I'm going to answer in a different order to the way you posted, because I think it will help to structure the discussion more clearly.
Anyway, let me expand on what you said. You differentiated between racial discrimination and socio-economic factors. Which is important for my argument as well.
I talked a lot about how socio-economic factors were superior to racial factors and you respond by claiming that socio-economic factors would not account for contemporary racial discrimination. This is wrong. It does indirectly, because any socio-economic situation will also be a result of race, as I am sure you will agree. Additionally, it in this sense will also ensure that those members of a given race really benefit, which are also in actual apparent need to do so.
(highlighting mine)
Sorry, I didn't understand the last sentence, so I hope I'm not misinterpreting this part of your post. You say "this is wrong" - is that not what we are trying to establish? Isn't it absolutely essential that we reach an agreement on whether racial discrimination, even when you control for socio-economic factors, still exists?
To put it more clearly, if I can prove to you that, when you control for all socio-economic factors, a black man will
still have fewer opportunities, lower wages, and so on, than an equivalently poor white man, will you agree that AA is necessary?
The rest of your post seems to rest on the assumption that socio-economic factors are sufficiently correlated with race to eliminate all differences between races. I agree that, if there was no racial discrimination in the West, and if all differences between races could be explained by socio-economic factors, that tackling tackling poverty etc would be enough to wipe out racial differences. What I'm saying is that this assumption isn't true, and various studies have shown this, so I hope we can narrow the discussion to just this one point: Can differences between races be explained entirely by socio-economic factors?
Mise, I am afraid I still don't agree with you, but I will make an effort to make everything as comprehensive and clear as necessary. I would appreciate it if you respected that and make room for the possibility that I may too have a point worth of consideration.
I know that this is commonly accepted as a fact, and I agree, but do you know actually of a single study that does control for socio-economic and at best also cultural factors and which shows the actual significance of race for success in life? I just looked on google for half an hour and did not find a thing (I could tell you though that even though black women die more often from breast cancer, race does not actually play a significant role

). To know the actual dimensions would probably be quit helpful, but I don't know where to take it from.
Well, let's take the example Deviate posted in the Tavern thread:
http://www.nber.org/papers/w9873.pdf
In this case, they have strictly controlled for
every variable. They are sending out 4 CVs to each company, randomly selected from 4 different "buckets" of CVs. The CVs get assigned random names, depending on whether they are in one of the "black" buckets or one of the "white" buckets, so the CVs themselves are
necessarily and strictly uncorrelated with any other variable that is present on the CV. The only difference is the name*. The good thing about CVs is that it contains everything that is necessary to judge employment; put another way, a CV contains all possible factors that could influence an employers' willingness to give the candidate an interview. So we know for a fact that, once you randomise the names of the CVs, all other possible callback-influencing factors are controlled for completely.
Now, your objection in the Tavern thread, that employers are using "black names" as a proxy for socio-economic status (or education or work experience etc), is also controlled for: employers
know the socio-economic status of the candidate, because it says so on the CV. Indeed, the researchers attempted to use the data to determine the level of "affluence-based" discrimination: employers judge candidates who come from affluent areas to be more employable (and therefore give more callbacks) than candidates who come from less affluent areas. And yet, the racial discrimination is
still present: blacks still get fewer callbacks from whites, even when they both live in affluent neighbourhoods.
This study, incidentally, should be totally conclusive to you. All other variables are controlled for strictly; the CVs are randomly assigned "black" or "white" names, and since all other data relevant to employment is listed, there is nothing else to consider. The differences, which are statistically significant, show a marked difference between black and white sounding names. There's really no room for negotiation here - it was a remarkably well-designed experiment, that avoids the common pitfalls of other experiments (most notably, exactly what variables they should control for).