Final answer:
Supporters of mercantilism believed in accumulating precious metals, promoting industrial development, and benefiting emerging industrialists.
Step-by-step explanation:
Supporters of mercantilism viewed the accumulation of precious metals as an activity essential to a nation's welfare. They believed that a nation's power and wealth depended on the amount of gold and silver it held. In order to achieve this, they promoted policies that emphasized industrial development as the primary source of a nation's wealth. Additionally, mercantilism generally resulted in trade policies that favored emerging industrialists and protected domestic industries.