Mercantilism was the prevailing economic system from the 16th to the 18th centuries, focused on increasing national wealth through protectionist trade practices, military might, and maintaining trade surpluses. This system was characterized by the idea that wealth, measured in precious metals, was finite and nations competed to accumulate it, often at the expense of others, leading to colonial exploitation and restrictive trade policies. Mercantilism ultimately gave way to free-market economics in the mid-18th century, but elements of its ideology continue to influence modern economic policies in some countries today.