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Models and Theories
Why did the author include the assumption?  Was it used

    a) to suggest the world actually behaves as assumed?

    b) to suggest that the theory only holds when the condition specified holds?

    c) to suggest the factor is irrelevant to the theory or its effects are negligible?

    d) to simplify some quite complex behaviour?

 Very Important
A successful challenge to the validity of a theory's assumption is not sufficient to discredit the usefulness of the theory



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