The surplus agricultural production here helped both internal and external trade. Things for daily use were exchanged in the local markets. These included rice, corn, vegetables, coconut oil, banana, and such things. There were daily markets, weekly markets, night markets and village markets for such exchanges. In the Unni Chiruthevi Charitram, there is a description of a practical exchange center at Ayanarchira in the region of Valluvanad. Similarly, in “Unnunili Sandesam”, there is a description of a daily market in Karianad near Thiruvalla.