This question <80|82> overall <80|82> CSM: <514|87>.  
  Question 157: Describe a situation in which something which was not produced as a commodity is converted into a commodity through the exchange.   
  [81] CSM: Hans [80] uses the example of a surplus of a crop by subsistence farmers. Yes, it can become a commodity through exchange or it can be thrown out for the crows. I would like to take a more critical look at the question. Take air for example, it has no exchange value in its natural form because it is available to everyone at no cost. Yet, you need air in your tires and cannot open the valve stem and let atmospheric pressure inflate the tire for you. So, you go to the gas station and pay $0.25 to use the air compressor. The commodity you are purchasing is not a ownership in the compressor but rather the conversion of air into compressed air. In this case the commodity becomes compressed air through exchange.   
 
 
 
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