But he also took it for granted that division of labor is itself responsible for economic growth and development and it accounts for the difference between expanding economies and those that stand still.

【参考答案】

但是他理所当然地认为劳动分工自身就能成为经济增长和发展的原因，并且它可以说明增长的经济体和那些停滞不前的经济体的不同。