Or, if I don't restrict the definition of 'black market' as consisting entirely of stolen goods.
Ok, only if you consider the non enforcement of copyright laws as a major component of capitalism....
Ok, only if you consider consumers facing prosecution for the purchase of products as a major component of capitalism.....
Ok, only if you consider tax avoidance as a major component of capitalism....
Ok, only if you consider conterfeiting as a major component of capitalism.....
Ok, only if you consider putting the consumer in a potentially physically harmful situation while purchasing goods as a major component of capitalism...
Ok, only if you consider the potential of the goods being confiscated due to the illegal purchase of said goods as a major component of capitalism.....
In that case the Black Market is a very pure form of capitalism.