How gold production drives expansion of the market
Here I assume that gold bullion serves as money material unless I indicate otherwise.
In a previous post, I indicated that there cannot be an overproduction of gold in its role as money material. This has been more or less the received view among Marxist writers over the years.
However, in thinking about this question more carefully I think my earlier post was incorrect on this point. I was correct in stating that from the viewpoint of capitalists as a whole there cannot be “too much” gold as far as the realization of value of (non-gold) commodities is concerned. The more gold there is relative to the quantity of other commodities, everything else remaining equal, the easier it will be for industrial and commercial capitalists to sell their commodities at their prices of production and thus realize the surplus value contained in them in the form of profit.
But what is true for the non-gold producing capitalists is not true for the gold producing capitalists. Indeed, from the viewpoint of an individual industrial capitalist there can never be too much of the commodities produced by their suppliers. As a productive consumer, industrial capitalist A can hope for nothing better than that supplier industrial capitalist B overproduces as much as possible. When B overproduces, all other things remaining equal, A gets to pocket some of the surplus value contained in B’s commodities. But from B’s point of view, the overproduction of B’s commodity is an absolute disaster.
True, the (non)gold producing capitalists do not consume gold, insomuch as gold serves as money material as opposed to raw material. But it is absolutely essential for them that gold is produced in adequate quantities if the value, including the surplus value, contained in their commodities is to be realized.
Even if gold bullion played no role whatsoever as raw material, a certain level of gold production would still be necessary for capitalist expanded reproduction to proceed. And capitalism can only exist as expanded reproduction.
How much gold capitalism needs—with the development of the credit system, banking, clearing houses, and so on being given—depends on the level and vigor of expanded reproduction at a particular time. The greater the possibilities of exploiting wage labor and the higher the rate of surplus value and the potential rate of profit in value terms, the higher the level of gold production must be if the process of expanded capitalist production is to proceed unchecked.