First of all your question is totally simplistic. Are we talking about the time in which minorities and women were allowed to take part in the Capitalist system from the time Capitalism actually began, since it became the dominant global force it is today, or since it was proposed as a system in theory? Are we talking about just in America or globally? Are Asians considered minorities or are we just talking about blacks? Would you consider certain groups to be excluded from the capitalist system because their countries followed a different system-- ala monarchy, communism, socialism, military dictatorship, etc.?
Your question is totally open ended and completely off base especially when it comes to women. Domestic relations laws, laws about inheritance, ownership and other factors such as religious and familial traditions/ customs have been the most crucial reasons why women were not on par with men in the free market place. Other important issues have involved civil rights issues (voting rights, education) and hiring practices (labor law). Those things on their own have nothing to do with Capitalism as a system itself. And-- if they did, what is your point exactly? That once we allowed women and blacks into the thick of things, the free market is incapable of sustaining itself? LOL Ok-- if that's your point, I suppose that we have only had true capitalism for about half a century in this country. Things were great up until about 2 years ago. I suppose the only recourse of the free market is to bring back slavery and prevent women from entering the workforce.