The evidence is throughout history...every time blacks attempt group capitalism, it is restrictive due to white interference...if not, it fails...the only time black capitalism has survived for long periods is if its individual so that blacks are not allowed to build a solid agency base...people who don't see this by now are sorely lost in this systemic hegemony...it doesn't work because the capitalist system, built on racist slave labor, is made to work like that.
Your Ayn Rand libertarian viewpoints do not work for black people.
Read these books.
There is no evidence to support yoru stance that capitalism by blacks doesn't work. White force and interference isn't evidence of capitalism failing, its evidence that black capitalism works so well that those who would see us as a threat seek to destroy it because it shows our power. So again from a basic look at what you are writing, it is clear you don't know much about what capitalism is, and you don't understand how coercion and government interference isn't a sign of capitalism but of socialism (economic grouping, not democratic socialism or political label)
Capitalism isn't built on slavery anymore than communism is built on slavery or socialism is built on the backs of societal sub-classes, and in other threads I've clearly explained why.
Ayn Rand isn't/wasn't a libertarian. She was proudly an Objectivist and didn't like Libertarians like Murray Rothbard, again learn what you are discussing before trying to critique.
Also black history in US shows counter to what you argue, capitalism had the whites in America scared of us and working over time to try to break our economic base by outright force and subterfuge with bullshyt like forced integration.
They did not want us to be able to cope without them.
Again I would suggest anyone who wants to look at the documented history of blacks engaging and suceeding in capitalism in the US, please read
Walter Williams Race and Economics.
Also I've heard good things about Dr. Juliet E. K. Walker's book The History of Black Business in America
She supposedly destroys a great deal of the BS people like Don Draper and white supremacists like to claim about us. She documents blacks being economically successful during slavery and after slavery, yet how the US government, not capitalism, but hte US government either subsidzes white or non-black business at the detriment of blacks or took direct action like a great deal of the union laws and labor laws to kick blacks out the market all together.
I'm goign to try to check the book out and scan it or buy it and scan it and upload it hopefully sometime this year, because seems like it is something people need to know about, but only libraries have the book and there are no eformats aviablable.