This policy will significantly boost the Gold output of buildings in Commercial Hubs, though they'll need to have a high adjacency bonus and/or be in large cities to benefit from it in the expansions. In Gathering Storm, it becomes much easier to leverage when playing as Mali (whose Suguba can be built adjacent to both a Holy Site and a River for a +4 bonus) or after building Machu Picchu (which will provide a +1 bonus to Commercial Hubs built adjacent to Mountains).
In a “free market” system, the prices for goods and services are set by consent between sellers and buyers dependent solely on the forces of supply and demand, rather than a government, monopoly or other controlling authority. There are two pillars to a free market: voluntary exchange and private property. Compelling intellectual arguments in favor of private ownership of all things would not be made until John Locke did so in the 17th Century. A century later Adam Smith would offer the most concise argument (he is considered by normally dour economists as the “father of free market economics”) for a laisse-faire economy, which he proposed benefitted everyone (greed being good) in a civilization equally.