There are unsatisfied circumstances of inadequate andexcessive supplies of network infommlion.The rea-son is that some infommlion providers haven't acquired all the profits or undertaken all the costs of infommfion providing,parts of profits or costs are owned by the exterior and not by themselves, so the externalities appear. The paper points out that we can take economic measures to lighten the unfavorable effects brought by externalities, assisted by measures of law, technology and public opinion guiding.
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