Capitalism is a process whereby wealth percolates upwards over time, such that the end result is nearly all wealth is concentrated in fewer and fewer hands while the bulk of the population becomes poorer and poorer.

Taken to its logical end, all the wealth would finally be concentrated in the arms of one person, and all the rest of the population would have nothing. Of course, it never reaches that point as some form of social upheaval (war, revolution, etc) will reset all the pieces. The process then starts all over again.