Though the whole picture of the paper cannot be described here in this summary, the following points can be the keys to the problematics of the theme. The term 'bipolarization' is often used in Japan of late years. But the category has never been made clear as far as I have surveyed. First of all, the paper aims at constructing theoretical types of 'bipolarization.' By doing this, the category can be clearer. 'Bipolarization' has some relevance to high informatization. For instance, high informatization tends to trigger 'positive feedback,' which can lead to 'bipolarization.' From the economic point of view, high informatization can reduce 'transaction cost.' Essencially 'transaction cost' stems from informational search. The worldwide network really contributes to the search. Moreover, 'bipolarization,' high informatization and reduction of 'transaction cost' affects school education. Nowadays, school education can be one of the objects of transactions in markets. -At the foot ofthe paper, I offered some actual proposals for possible types of school education in such an era.
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