Yea, but that's the whole problem. You can't get what you want just because you don't happen to produce what the other person wants.
Discussion
That happens with every economic system, where any transaction takes place, creating the inevitable disparity. When a group saw industrialization they realised the plight of poor and came up with idea of socialism, and it worked till it became bogus, because no matter how you were to twist the rule, someone will stay out of the system. This is something every one should accept.
How does this connect to bartering? I don’t understand.