The less you have those, the less efficient your market is. "Free markets" aren't these magical things that arise on their own in nature. They are carefully crafted and maintained artificial environments and most are far from efficient.
Market forces are not a silver bullet that will solve all problems if we just sit around and wait long enough for the invisible hand to do everything.
Many would include trust, non-collusion and other acts to be against the concept of free market/trade.
Although some would draw the line at different locations, but anti-trust, collusion, patents etc. part of the system. It's just a matter of how much to limit either the government and public good vs. the corporations.
In this case, collusion in trade is obviously a violation of anti-trust law.
This is what happens in a free market.