Answer:
Demand is in direct relationship to Supply, which both effect trade. Demand is the want of consumers to gain more of the product. Supply is the supplying of the wanted product, and the satisfying of customers.
Example:
The General Store sold out of lollipops two times this week. The store decided it would be best to put two shipment orders in for lollipops ahead of time.
Demand- Customers wanting lollipops from store
Supply- Store buying more lollipops and meeting consumer needs
:)