The market isn't voluntary by it's very nature, either you have what is wanted to trade or trade doesn't occur.
You force me to get what you want for you while denying me what you have that I need.
If that is my 23rd pair of shoes, well, that is one thing, but if that is supper, or shelter from the rain, then that is another, different, thing.
Crapitalism isn't voluntary, if it was the shareholders/boss wouldn't be getting such a big cut of the pie.
After all it is the truck loader that is indispensable, not the shareholder.