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A free market would allow the employees to unionise to negotiate more effectively the employee side, like Amazon the company uses many people collectively to negotiate the employer side. But Amazon is anti-union and spends money to that effect.

If the free market is a fair market, unionising wouldn't make any difference as the negotiated rates would already be fair and couldn't be any more fair. Amazon wouldn't be spending money to block union efforts, because that would be wasted money. Therefore either this isn't free market, and your comment is wrong (not free market), or this is free market but it isn't fair so your comment is wrong (free market, yet still relevant).