这些措施在不同学派的经济理论根源。
These measures have roots in different schools of thought in terms of economic theory.
而究其理论根源，信息不对称是一个主要理由。
Trace to its theoretic source, information asymmetry is one of main reasons.
究其理论根源，可以用信息经济学中的信息的不对称理论来解释。
Theoretically, it can be explained by information dissymmetry theory from information economics'point of view.
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