I don't dispute that there is a difference in outcomes based on different measurements, I dispute the concept that there is some inherent racial bias in wages and that capitalism is at fault. The outcomes that you're measuring don't demonstrate this suggestion.
If there is an anti-black bias in wages, is there also a pro-Asian bias in wages? By the same measurements I'm sure you can find, Asians tend to have higher incomes than whites, blacks, or Hispanics.
It’s a matter of what’s been built up. Capitalism in the world today, particularly where it has laid its oldest roots i.e. in Europe and America, was built on the foundation of some very serious and intentional exploitation of colonized people. The same relationship that bore out between the British colonial masters and their subjects also bore out between white and Black Americans. And capitalism has paid handsomely for this exploitation: the entire imperialist venture can be described as a mission to subjugate distant working class populations, so that their benefits in collective bargaining and political representation are as marginalized as possible, so as to exploit them all the better.
In America this process occurred at home, in the Jim Crow era and beyond, through the formation of Black America: where there is limited access to every social benefit including education, and where people are relegated by the virtue of their “status” and poor education to the lowest jobs with the weakest bargaining. This is the structure people refer to as institutionalized racism, and it is defended by the passive approval of the white working class population, which are turned on their Black working peers by any reinforcement of policy that can divide them.
Now something you and TMIT mentioned was that you’d expect to see whites priced out of their work
in aggregate, even taking into consideration the higher quality of jobs that tend to be available to the white population. As a matter of fact this is exactly what happens. Broadly speaking this occurs at a global basis and compares workers across national borders, comparing colonized workers and non-colonized workers. In the colonial era, white officers and native officers were a constant source of friction with one another, as there weren’t enough jobs for both and whites were more expensive and bad for local politics, but the colonial administrators (and commentators at home) had a wariness about promoting natives too high. Still, the native officers knew what they were worth, and it was hard to argue with the results. Interestingly, despite a surplus of native professionals, the system was never able to hire them all despite the apparent benefits to doing so, and the bargaining position of those officers was weak until the political situation got worse. Maybe you don’t consider this a capitalist example, but the flaw here is not being bad capitalists so much as building a capitalist enterprise on the foundation of racial division. It is profitable for as long as you can exploit safely, but you always need to give out a little education to get the workers you need, and even a little can be too much. There are many parallels to be drawn from here to the atrocious nature of education served to the American Black population.
Or take a more modern example. The US has sold a good portion of its manufacturing jobs abroad as part of the financialization strategy, what they call the transition to a “service sector” economy. Ask anyone who has to work in the service sector, they have traded good steady factory work for a chaotic jungle of difficult, poorly compensated labor that is problematic to organize due to high turnover rates and a surplus of labor in general. What you now have is a large population of Americans working these jobs, and an economic allergy to “reintroducing“ manufacturing because the cost of labor is just too damn high compared to the labor available in the developing world. Effectively, in the views of the owners, the white working class has priced itself out of manufacturing jobs; and sure enough, Chinese wages have soared and American wages have stayed flat.
So take Black professionals in America. For all we know white professionals are already being priced out of their jobs: let’s say you really were a greedy capitalist, you may acknowledge hiring a woman or a Black person may let you get just as much work for less pay. And you can get away with this due to the weak leverage of those workers, relatively speaking. Despite the establishment of whites as the professional class this must already be happening. So the question as it pertains to your objection is “How many Black professionals need to be competing for the jobs before prices can go down in aggregate?”
It is not, as you suggest, “How can there be a surplus of Black lower level labor and a deficit of Black professional labor?” It is very clear to see how this can be the case, and furthermore clear to see how the system has manifested this state of affairs.