Sure they do, although almost certainly nowhere near enough to sustain our current situation and the system it's built atop of (from which the holders of capital seem to have benefited immensely), although perhaps this is exactly the point you were making.
It might not be recognizable to most people living in modernity today, but in general humans will always trade (by some means, not necessarily with "money") with other humans whenever relative specializations occur between them, which even in small groups is likely to happen naturally.
After all, it's not the exchange of paper bills or service to capital in particular that makes an economy, and there is always going to be demand of something and some supply of some of those things as long as humans are around and interacting, regardless of how miserable the existence is, or how "inefficient" such a system might be.