These two devices are necessary, bring a lot of benefits, so it is difficult to give a ch n.ngo I, we also need to consider another aspect is the opportunity cost. The concept of opportunity cost is a useful theory of choice. It uses too frequent and extensive economic life. The opportunity cost is the scarcity of resources based on the database, so we are forced to make choices. Choice is to do is to get a good change, which compel us to change or abandon a certain cost to him. NH, one of the best plan is to give up the implementation of the opportunity cost when the benefits are lost in choose not to choose this option, also can choose H n solution well.
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