Capitalism has worked well when it existed. For the few decades between bank monopoly you can see the rise of prosperity in America for all whom it defined as "citizens" (racism+sexism not good....). However most of our history we have been dominated by the hegemony of private banking which by its very nature prevents capitalism to exist.

I shall now quote Thomas Jefferson.

"I believe that banking institutions are more dangerous to our liberties than standing armies . . . If the American people ever allow private banks to control the issue of their currency, first by inflation, then by deflation, the banks and corporations that will grow up around [the banks] . . . will deprive the people of all property until their children wake-up homeless on the continent their fathers conquered . . . The issuing power should be taken from the banks and restored to the people, to whom it properly belongs."