As we see in Haiti and other places, a capitalistic economy can still be a disaster if the governance is totally corrupt.
And how does one define economic success? GDP? Standard of living? Economic freedom?
These ^^^ are key Q's Task
For starters , if we consider capitalism a constitutional construct , it would serve 'we the peeps' , and by that we consider ALL the peeps, not just the chosen few.
What metric quantifies ,validates this is even more vexing......
considering the effects might be worthy>
&&&

see the connection?
~S~