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To use an example, the natives in Joseph Conrad's story "The Heart of Darkness" serving the Europeans in exchange for pieces of copper wire are not ignoramuses who do not understand the concept of value. They understand it it perfectly - to them, the possession of shiny metal, such as copper wire, is a manifestation of one's social status, and thus dignity, which is of ultimate value. They act quite rationally when they go to great lengths to obtain objects manifesting that value. It is the Europeans who are are ignoramuses, as they fail to grasp this simple principle of human social behavior, and confused the principle with its manifestation.
^^^^^^^ CB: If some people value having shiny metal, isn't it understandable that some people value virtual gaming or just gaming ? In the society of computer gamers, playing games or winning more games gives social status. So, the virtual game time has use-value for them, just as pieces of copper wire had use-value for the Africans in the novel.