The passage describes the principles behind mercantilism.
The excerpt refers to a system which prioritizes the enrichment using trade as its main focus, instead of farming ("[...] enrich a great nation rather by trade and manufacturing than by the improvement and cultivation of land [...]").
Mercantilism is also known to stimulate the industry and urbanization growth, a fact that is explicit in the passage. A country with developed mercantilism had a policy that maximized exportation and industrialization through economic policies and interventionism.