Not that any treatise on Political Economy can discuss or even enumerate all these causes;but it undertakes to set forth as much as is known of the laws and principles according to which they operate.

 
  • 并不是任何一本政治经济学著作都能论述甚或是列举出所有这些因素,但总要尽量阐明制约它们起作用的规律和原理。
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