Mercantilism was an economic policy that dominated European economic thinking and practice from the 16th to the late 18th century. It aimed to increase national wealth and power by imposing strict controls over colonies and trade. Key aspects included encouraging exports and discouraging imports, maintaining a positive balance of trade, and accumulating gold and silver. The ideas of mercantilism were influential in Europe during this period and laid the foundations for modern capitalism and ideas of economic nationalism.