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1·In the model, the production function is assumed to be nonclassic and constant returns to scale.

该模型的生产函数是满足“新古典”条件的一次齐次函数。

2·The Comparative Advantage Theory of David Ricardo is constructed on a series of assumptions including perfect competition and constant returns to scale.

李嘉图的比较优势理论是建立在完全竞争与规模报酬不变等一系列假设条件之下的。