There really is not much difference between capitalism...
...and primitive barter systems used by the Phoenicians, for example. It is just what happens when everyone seeks their own financial benefit (which is what people do). Attempts to make it fairer or more moral thru regulation (preventing burning down the village if you don't like the price offered, for example) sometimes work and sometimes do not.
But my contention is that it is the basic system that exists and anything else we may implement, is just an attempt to deviate from it or modify it.