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We have to use everything we can get, and use our curiosity to enhance our sense of well-being.So far, we have made ourselves a lot of various tools, but we don't know which ones will be useful.Maybe a tool we no longer want is useful to someone else, and maybe we need their tool too.In this way we discover the usefulness of exchange.But in order to exchange, we must understand each other's needs, what tools are used by others, and how they are willing to exchange.In this way, the concept of social relations is gradually formed in the child's mind before he really becomes an active member of society.Emile understood that she had to use tools, and others also had tools, and they could exchange them when needed.I easily made him feel the need and benefits of the exchange.