In fact, a free market is dehumanizing because whether or not some entities participate in free market exchange has nothing to do with whether or not they are human. The concept of a free market only takes into account motivations to trade and subsequent evaluations, which has nothing to to with being human. Robots can engage in a free market with aliens. In a free market, your human attributes are set aside as irrelevant, except to the extent that being human gives you human-specific needs and desires that are relevant to the trade.