Mercantilism was an economic system of trade that spanned from the 16th century to the 18th century.Mercantilism is based on the principle that the world's wealth was static, and consequently, many European nations attempted to accumulate the largest possible share of that wealth by maximizing their exports and by limiting their imports via tariffs.
The Indus river was a constant flow of natural resources. The river also made the soil very fertile and that meant good crops when planted in the right season, it also made it easy for trade boats to pass through.