mercantilism promoted the idea that national wealth was based on\nlower tariffs\nforeign investment\nan…

Brief Explanations:

Mercantilism emphasized that a nation's wealth was measured by its stock of precious metals. A favorable balance of trade (exporting more than importing) was seen as a way to bring in more precious metals (like gold and silver) into the country. Lower tariffs would allow more imports (which mercantilists generally opposed as it could lead to a loss of precious metals if imports exceeded exports). Foreign investment was not a central tenet of mercantilism. An isolationist military policy has no direct relation to the economic theory of mercantilism which focused on trade - related wealth accumulation.

Answer:

a favorable balance of trade