# Kelp ## Definition A type of seaweed that, when burned, produces an alkaline salt used in glassmaking, soap production, and other industrial processes. Kelp grows on rocky shores within the high-water mark and can be harvested without cultivation. ## Source Chapter Book I, Chapter 11 ## Context Smith uses kelp as an example of a natural product that can command rent even though it requires no human improvement, demonstrating that rent is not solely a function of agricultural improvements but also reflects the natural productive capacity of land. ## Economic Domain Production ---