How did mercantilism affect exploration and colonization for the Europeans?

Mercantilism was the driving force behind colonization. Mercantilism is an economic theory based on the belief that there is a limited amount of wealth in the world and that colonies exist solely for the benefit of the mother country....colonies provide the mother country with raw materials, ready-made markets for domestic goods, and a safety valve for excess population. Why else would anyone establish colonies if not for their economic benefit?