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This article proposes a framework of rational behavior in language learning , which should be understood both from an evolutionary point of view including genetic and cultural factors and from a socially interactive point of view including rational choice made by the learner and rational influence by the power-structure built in learning environment .The economic model of language learning focuses on rational choice of the learner, given as parameters of all other factors aforementioned , resulting in a four-dimensional space of difficulty-measurement in language learning with the points nearest to the origin representing the words' pragmatistic easiness to the learner whose rational choice finally stops the learning process within a bounded area in the 4-D space . Different individuals with different life-histories and environmental structures therefore end in different areas in the 4-D space , and showing different aspects as well as degrees of rationality (the so-called Multiple lntelligence for example).No matter how formal the economic model of language learning can be , it cannot model all characteristics of language activities in social interaction , just as no model can represent a complete individual human life.

汪丁丁

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